Initial commit

.gitattributes

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+app/src/main/cpp/** linguist-vendored
+pdfiumandroid/** linguist-vendored

.gitignore

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+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx
+local.properties
+.env
+*.jks
+google-services.json
+.kotlin/
+.idea/

app/.gitignore

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+/build

app/build.gradle.kts

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+@file:Suppress("UnstableApiUsage")
+
+import java.util.Properties
+
+plugins {
+    alias(libs.plugins.android.application)
+    alias(libs.plugins.kotlin.android)
+    alias(libs.plugins.kotlin.compose)
+    id("org.jetbrains.kotlin.plugin.serialization") version "2.1.20"
+    alias(libs.plugins.kotlin.ksp)
+}
+
+val localProperties = Properties()
+val localPropertiesFile = rootProject.file("local.properties")
+if (localPropertiesFile.exists()) {
+    localPropertiesFile.inputStream().use { localProperties.load(it) }
+}
+
+android {
+    namespace = "com.aryan.reader"
+    compileSdk = 35
+
+    defaultConfig {
+        applicationId = "com.aryan.reader"
+        minSdk = 26
+        targetSdk = 35
+        versionCode = 32
+        versionName = "1.0.31"
+
+        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
+        externalNativeBuild {
+            cmake {
+                cppFlags += ""
+            }
+        }
+        buildConfigField("boolean", "IS_PRO", "false")
+    }
+
+    flavorDimensions += "version"
+    productFlavors {
+        create("oss") {
+            dimension = "version"
+            applicationIdSuffix = ".oss"
+            versionNameSuffix = "-oss"
+            buildConfigField("String", "AI_WORKER_URL", "\"\"")
+            buildConfigField("String", "VERIFIER_WORKER_URL", "\"\"")
+            buildConfigField("String", "FEEDBACK_WORKER_URL", "\"\"")
+            buildConfigField("boolean", "IS_PRO", "false")
+        }
+    }
+
+    packaging {
+        resources {
+            excludes += "/META-INF/{AL2.0,LGPL2.1}"
+        }
+    }
+
+    signingConfigs {
+        create("release") {
+            val storePath = localProperties.getProperty("MYAPP_RELEASE_STORE_FILE")
+            if (!storePath.isNullOrEmpty()) {
+                storeFile = file(storePath)
+                storePassword = localProperties.getProperty("MYAPP_RELEASE_STORE_PASSWORD")
+                keyAlias = localProperties.getProperty("MYAPP_RELEASE_KEY_ALIAS")
+                keyPassword = localProperties.getProperty("MYAPP_RELEASE_KEY_PASSWORD")
+            }
+        }
+    }
+
+    buildTypes {
+        release {
+            signingConfig = signingConfigs.getByName("release")
+            isMinifyEnabled = true
+            proguardFiles(
+                getDefaultProguardFile("proguard-android-optimize.txt"),
+                "proguard-rules.pro"
+            )
+        }
+    }
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
+    }
+    kotlinOptions {
+        jvmTarget = "17"
+    }
+    buildFeatures {
+        compose = true
+        buildConfig = true
+    }
+    publishing {
+        singleVariant("release") {
+        }
+    }
+    externalNativeBuild {
+        cmake {
+            path = file("src/main/cpp/CMakeLists.txt")
+            version = "3.22.1"
+        }
+    }
+}
+//noinspection UseTomlInstead
+dependencies {
+
+    implementation(libs.androidx.core.ktx)
+    implementation(libs.androidx.lifecycle.runtime.ktx)
+    implementation(libs.androidx.activity.compose)
+    implementation(platform(libs.androidx.compose.bom))
+    implementation(libs.androidx.ui)
+    implementation(libs.androidx.ui.graphics)
+    implementation(libs.androidx.ui.tooling.preview)
+    implementation(libs.androidx.material3)
+    implementation(libs.androidx.material3.window.size.class1.android)
+    implementation(libs.androidx.credentials)
+
+    androidTestImplementation(libs.androidx.junit)
+    androidTestImplementation(libs.androidx.espresso.core)
+    androidTestImplementation(platform(libs.androidx.compose.bom))
+    androidTestImplementation(libs.androidx.ui.test.junit4)
+    androidTestImplementation("androidx.test:rules:1.7.0")
+    androidTestImplementation("androidx.test.espresso:espresso-web:3.7.0")
+    androidTestImplementation("com.google.truth:truth:1.4.2")
+    androidTestImplementation("androidx.navigation:navigation-testing:2.9.6")
+    androidTestImplementation("io.mockk:mockk-android:1.13.11") {
+        exclude(group = "org.junit.jupiter")
+    }
+    androidTestImplementation(libs.kotlinx.coroutines.test)
+
+    debugImplementation(libs.androidx.ui.test.manifest)
+
+    implementation(libs.androidx.room.runtime)
+    implementation(libs.androidx.room.ktx)
+
+    ksp(libs.androidx.room.compiler)
+
+    implementation("androidx.compose.material:material-icons-extended:1.7.8")
+
+    implementation("androidx.appcompat:appcompat:1.7.1")
+
+    //noinspection GradleDependency (Updating these might cause the custom toolbox in pagination to break)
+    implementation("androidx.navigation:navigation-compose:2.9.2")
+    //noinspection GradleDependency
+    implementation("androidx.lifecycle:lifecycle-viewmodel-compose:2.9.2")
+    //noinspection GradleDependency
+    implementation("androidx.lifecycle:lifecycle-runtime-compose:2.9.2")
+    //noinspection GradleDependency
+    implementation("androidx.compose.material3.adaptive:adaptive:1.2.0-alpha11")
+
+    implementation("org.jsoup:jsoup:1.17.2")
+
+    implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.7.3")
+    implementation("org.jetbrains.kotlinx:kotlinx-serialization-protobuf:1.7.3")
+
+    implementation("io.coil-kt:coil-compose:2.7.0")
+    implementation("io.coil-kt:coil-svg:2.6.0")
+
+    implementation(project(":pdfiumandroid"))
+
+    implementation("androidx.media3:media3-exoplayer:1.8.0")
+    implementation("androidx.media3:media3-session:1.8.0")
+    implementation("androidx.media3:media3-ui:1.8.0")
+
+    implementation("androidx.work:work-runtime-ktx:2.10.5")
+    implementation("androidx.compose.runtime:runtime-livedata:1.9.3")
+
+    implementation("org.slf4j:slf4j-android:1.7.36")
+
+    implementation("org.commonmark:commonmark:0.22.0")
+
+    implementation("com.jakewharton.timber:timber:5.0.1")
+
+    implementation("com.tom-roush:pdfbox-android:2.0.27.0")
+
+    implementation("androidx.paging:paging-runtime-ktx:3.3.6")
+    implementation("androidx.paging:paging-compose:3.3.6")
+    implementation("androidx.room:room-paging:2.7.1")
+
+    // Flexmark for Markdown parsing (MD -> HTML)
+    implementation("com.vladsch.flexmark:flexmark:0.64.8")
+    implementation("com.vladsch.flexmark:flexmark-ext-tables:0.64.8")
+    implementation("com.vladsch.flexmark:flexmark-ext-gfm-strikethrough:0.64.8")
+    implementation("com.vladsch.flexmark:flexmark-ext-gfm-tasklist:0.64.8")
+    implementation("com.vladsch.flexmark:flexmark-ext-autolink:0.64.8")
+
+    implementation("androidx.documentfile:documentfile:1.0.1")
+    implementation("androidx.browser:browser:1.8.0")
+}

app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+-renamesourcefileattribute SourceFile
+
+# Fix for Firestore crash in release builds.
+# This prevents ProGuard from removing the default constructor and fields
+# that Firestore needs for data serialization and deserialization.
+-keepattributes Signature
+-keep class com.google.firebase.firestore.** { *; }
+-keepnames class com.google.protobuf.** { *; }
+
+# IMPORTANT: Keep all your data model classes that you use with Firestore.
+# The following rule covers all classes in your 'data' package.
+-keep class com.aryan.reader.data.** {
+    <init>();
+    *;
+}
+
+# Keep MobiParser inner classes that are accessed from JNI.
+# ProGuard/R8 can't detect this usage, so we must keep them explicitly
+# to prevent renaming/removal in release builds.
+-keep class com.aryan.reader.epub.MobiParser$* {
+    <init>(...);
+    *;
+}
+
+# Keep classes for Google Sign In and Credential Manager
+-keep class com.google.android.libraries.identity.googleid.** { *; }
+-keep class com.google.android.gms.auth.api.identity.** { *; }
+-keep class androidx.credentials.** { *; }
+
+# Keep classes for Firebase Auth
+-keep class com.google.firebase.auth.** { *; }
+
+# These rules can help prevent gRPC-related issues in release builds.
+-keep class io.grpc.** { *; }
+-dontwarn com.squareup.okhttp.**
+
+#noinspection ShrinkerUnresolvedReference
+-dontwarn com.google.protobuf.GeneratedMessageV3
+-keepclassmembers class * extends com.google.protobuf.GeneratedMessageV3 {
+    <fields>;
+}
+
+# Keep GSON TypeToken for proper JSON serialization/deserialization in release builds.
+# This prevents R8 from stripping generic type information needed by Gson.
+-keep class com.google.gson.reflect.TypeToken { *; }
+-keep class * extends com.google.gson.reflect.TypeToken
+
+-keep class com.aryan.reader.paginatedreader.Woff2Converter { *; }
+
+-dontwarn com.gemalto.jp2.**
+
+# Flexmark Markdown parser rules
+-keep class com.vladsch.flexmark.** { *; }
+-keepnames class com.vladsch.flexmark.** { *; }
+-keepclassmembers class com.vladsch.flexmark.** { *; }
+
+-dontwarn java.awt.**
+-dontwarn javax.swing.**
+-dontwarn javax.imageio.**
+
+-keepattributes Signature, EnclosingMethod, InnerClasses, *Annotation*

app/src/androidTest/java/com/aryan/reader/AppNavigationTest.kt

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+// AppNavigationTest.kt
+package com.aryan.reader
+
+import android.net.Uri
+import androidx.compose.material3.windowsizeclass.ExperimentalMaterial3WindowSizeClassApi
+import androidx.compose.material3.windowsizeclass.WindowSizeClass
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.test.junit4.createComposeRule
+import androidx.compose.ui.unit.DpSize
+import androidx.compose.ui.unit.dp
+import androidx.navigation.compose.ComposeNavigator
+import androidx.navigation.testing.TestNavHostController
+import androidx.test.core.app.ApplicationProvider
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.aryan.reader.epub.EpubBook
+import kotlinx.coroutines.flow.MutableStateFlow
+import org.junit.Assert.assertEquals
+import org.junit.Before
+import org.junit.Rule
+import org.junit.Test
+import org.junit.runner.RunWith
+
+@RunWith(AndroidJUnit4::class)
+class AppNavigationTest {
+
+    @get:Rule
+    val composeTestRule = createComposeRule()
+
+    private lateinit var navController: TestNavHostController
+    private val fakeUiState = MutableStateFlow(ReaderScreenState())
+
+    // Mock ViewModel that uses the fake state
+    private val fakeViewModel: MainViewModel = object : MainViewModel(
+        ApplicationProvider.getApplicationContext()
+    ) {
+        override val uiState = fakeUiState
+        override fun clearSelectedFile() {
+            fakeUiState.value = fakeUiState.value.copy(
+                selectedFileType = null,
+                selectedPdfUri = null,
+                selectedEpubBook = null
+            )
+        }
+    }
+
+    @OptIn(ExperimentalMaterial3WindowSizeClassApi::class)
+    @Before
+    fun setup() {
+        composeTestRule.setContent {
+            navController = TestNavHostController(LocalContext.current)
+            navController.navigatorProvider.addNavigator(ComposeNavigator())
+            AppNavigation(
+                navController = navController,
+                windowSizeClass = WindowSizeClass.calculateFromSize(DpSize(400.dp, 800.dp)),
+                viewModel = fakeViewModel
+            )
+        }
+    }
+
+    @Test
+    fun appNavigation_defaultStartDestination_isMainRoute() {
+        val currentRoute = navController.currentBackStackEntry?.destination?.route
+        assertEquals(AppDestinations.MAIN_ROUTE, currentRoute)
+    }
+
+    @Test
+    fun appNavigation_whenPdfSelected_navigatesToPdfViewer() {
+        // Trigger state change
+        fakeUiState.value = ReaderScreenState(
+            selectedFileType = FileType.PDF,
+            selectedPdfUri = Uri.parse("content://dummy.pdf")
+        )
+
+        // Let compose recompose and run LaunchedEffect
+        composeTestRule.waitForIdle()
+
+        val currentRoute = navController.currentBackStackEntry?.destination?.route
+        assertEquals(AppDestinations.PDF_VIEWER_ROUTE, currentRoute)
+    }
+
+    @Test
+    fun appNavigation_whenEpubSelected_navigatesToEpubReader() {
+        // Trigger state change
+        fakeUiState.value = ReaderScreenState(
+            selectedFileType = FileType.EPUB,
+            selectedEpubBook = EpubBook(
+                fileName = "dummy.epub",
+                title = "Dummy Book",
+                author = "Author",
+                language = "en",
+                coverImage = null
+            )
+        )
+
+        composeTestRule.waitForIdle()
+
+        val currentRoute = navController.currentBackStackEntry?.destination?.route
+        assertEquals(AppDestinations.EPUB_READER_ROUTE, currentRoute)
+    }
+
+    @Test
+    fun appNavigation_whenFileCleared_navigatesBackToMain() {
+        // First, navigate to PDF viewer
+        fakeUiState.value = ReaderScreenState(
+            selectedFileType = FileType.PDF,
+            selectedPdfUri = Uri.parse("content://dummy.pdf")
+        )
+        composeTestRule.waitForIdle()
+        assertEquals(AppDestinations.PDF_VIEWER_ROUTE, navController.currentBackStackEntry?.destination?.route)
+
+        // Then, trigger the clear action (simulating onNavigateBack)
+        fakeViewModel.clearSelectedFile()
+        composeTestRule.waitForIdle()
+
+        val currentRoute = navController.currentBackStackEntry?.destination?.route
+        assertEquals(AppDestinations.MAIN_ROUTE, currentRoute)
+    }
+}

app/src/androidTest/java/com/aryan/reader/MainDispatcherRule.kt

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+package com.aryan.reader
+
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.test.TestDispatcher
+import kotlinx.coroutines.test.UnconfinedTestDispatcher
+import kotlinx.coroutines.test.resetMain
+import kotlinx.coroutines.test.setMain
+import org.junit.rules.TestWatcher
+import org.junit.runner.Description
+
+/**
+ * A JUnit TestRule that sets the Main dispatcher to a TestDispatcher for the duration of a test.
+ * This allows tests to execute coroutines on the Main dispatcher without needing a real Android environment.
+ */
+@OptIn(ExperimentalCoroutinesApi::class)
+class MainDispatcherRule(
+    private val testDispatcher: TestDispatcher = UnconfinedTestDispatcher()
+) : TestWatcher() {
+    override fun starting(description: Description) {
+        Dispatchers.setMain(testDispatcher)
+    }
+
+    override fun finished(description: Description) {
+        Dispatchers.resetMain()
+    }
+}

app/src/androidTest/java/com/aryan/reader/epubreader/ChapterWebViewBridgeTest.kt

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+package com.aryan.reader.epubreader
+
+import com.google.common.truth.Truth.assertThat
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.test.advanceUntilIdle
+import kotlinx.coroutines.test.runTest
+import org.json.JSONArray
+import org.json.JSONObject
+import org.junit.Rule
+import org.junit.Test
+
+@OptIn(ExperimentalCoroutinesApi::class)
+class ChapterWebViewBridgeTest {
+
+    @get:Rule
+    val mainDispatcherRule = MainDispatcherRule()
+
+    @Test
+    fun cfiJsBridge_onCfiExtracted_callsCallbackWithCorrectCfi() {
+        var receivedCfi = ""
+        val bridge = CfiJsBridge(
+            onCfiReady = { cfi -> receivedCfi = cfi },
+            onCfiForBookmarkReady = {}
+        )
+
+        val cfi = "/4/2[chapter1]/6:10"
+        val jsonResponse = JSONObject().apply {
+            put("cfi", cfi)
+            put("log", JSONArray(listOf("log message 1", "log message 2")))
+        }.toString()
+
+        bridge.onCfiExtracted(jsonResponse)
+
+        assertThat(receivedCfi).isEqualTo(cfi)
+    }
+
+    @Test
+    fun cfiJsBridge_onCfiExtracted_withInvalidJson_callsCallbackWithFallbackCfi() {
+        var receivedCfi = ""
+        val bridge = CfiJsBridge(
+            onCfiReady = { cfi -> receivedCfi = cfi },
+            onCfiForBookmarkReady = {}
+        )
+
+        val invalidJson = "this is not json"
+
+        bridge.onCfiExtracted(invalidJson)
+
+        assertThat(receivedCfi).isEqualTo("/4")
+    }
+
+    @Test
+    fun cfiJsBridge_onCfiExtracted_withEmptyCfi_callsCallbackWithCfi() {
+        var receivedCfi: String? = null
+        val bridge = CfiJsBridge(
+            onCfiReady = { cfi -> receivedCfi = cfi },
+            onCfiForBookmarkReady = {}
+        )
+
+        val jsonResponse = JSONObject().apply {
+            put("cfi", "")
+            put("log", JSONArray())
+        }.toString()
+
+        bridge.onCfiExtracted(jsonResponse)
+
+        // The handler is only called if the CFI is not blank, so it should remain null
+        assertThat(receivedCfi).isNull()
+    }
+
+    @Test
+    fun ttsJsBridge_onStructuredTextExtracted_callsHandlerWithJson() = runTest {
+        var receivedJson: String? = null
+        val bridge = TtsJsBridge(
+            scope = this,
+            ttsStructuredTextHandler = { json -> receivedJson = json }
+        )
+        val jsonPayload = "[{\"text\":\"Hello world\",\"cfi\":\"/4/2\"}]"
+        bridge.onStructuredTextExtracted(jsonPayload)
+        advanceUntilIdle()
+        assertThat(receivedJson).isEqualTo(jsonPayload)
+    }
+
+    @Test
+    fun ttsJsBridge_onStructuredTextExtracted_withEmptyJson_callsHandlerWithEmptyArray() = runTest {
+        var receivedJson: String? = null
+        val bridge = TtsJsBridge(
+            scope = this,
+            ttsStructuredTextHandler = { json -> receivedJson = json }
+        )
+        val jsonPayload = ""
+        bridge.onStructuredTextExtracted(jsonPayload)
+        advanceUntilIdle()
+        assertThat(receivedJson).isEqualTo("[]")
+    }
+
+    @Test
+    fun snippetJsBridge_onSnippetExtracted_callsCallbackWithCfiAndSnippet() {
+        var receivedCfi = ""
+        var receivedSnippet = ""
+        val bridge = SnippetJsBridge(
+            onSnippetReady = { cfi, snippet ->
+                receivedCfi = cfi
+                receivedSnippet = snippet
+            }
+        )
+
+        val cfi = "/4/8:5"
+        val snippet = "This is the bookmark snippet."
+        bridge.onSnippetExtracted(cfi, snippet)
+
+        assertThat(receivedCfi).isEqualTo(cfi)
+        assertThat(receivedSnippet).isEqualTo(snippet)
+    }
+
+    @Test
+    fun progressJsBridge_onTopChunkUpdated_invokesCallback() {
+        var updatedChunk = -1
+        val bridge = ProgressJsBridge(onTopChunkUpdated = { index -> updatedChunk = index })
+
+        bridge.updateTopChunk(5)
+        assertThat(updatedChunk).isEqualTo(5)
+
+        bridge.updateTopChunk(10)
+        assertThat(updatedChunk).isEqualTo(10)
+    }
+
+    @Test
+    fun progressJsBridge_onTopChunkUpdated_doesNotCallForSameIndex() {
+        var callCount = 0
+        val bridge = ProgressJsBridge(onTopChunkUpdated = { callCount++ })
+
+        bridge.updateTopChunk(3)
+        assertThat(callCount).isEqualTo(1)
+
+        // Reporting the same index should not trigger the callback again
+        bridge.updateTopChunk(3)
+        assertThat(callCount).isEqualTo(1)
+
+        bridge.updateTopChunk(4)
+        assertThat(callCount).isEqualTo(2)
+    }
+
+    @Test
+    fun aiJsBridge_onContentExtracted_invokesCallback() = runTest {
+        var receivedContent: String? = null
+        val bridge = AiJsBridge(
+            scope = this,
+            onContentReady = { content -> receivedContent = content }
+        )
+        val content = "This is the chapter content for summarization."
+        bridge.onContentExtractedForSummarization(content)
+        advanceUntilIdle()
+        assertThat(receivedContent).isEqualTo(content)
+    }
+}

app/src/androidTest/java/com/aryan/reader/epubreader/EpubReaderBookmarkTest.kt

@@ -0,0 +1,93 @@
+package com.aryan.reader.epubreader
+
+import android.content.Context
+import androidx.test.core.app.ApplicationProvider
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.aryan.reader.epub.EpubChapter
+import com.google.common.truth.Truth.assertThat
+import org.json.JSONArray
+import org.json.JSONObject
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+
+@RunWith(AndroidJUnit4::class)
+class EpubReaderBookmarkTest {
+
+    private lateinit var context: Context
+    private val testBookTitle = "My Test Book"
+    private val chapters = listOf(
+        EpubChapter(chapterId = "ch1", title = "Chapter 1", htmlFilePath = "", absPath = "", htmlContent = "", plainTextContent = ""),
+        EpubChapter(chapterId = "ch2", title = "Chapter 2", htmlFilePath = "", absPath = "", htmlContent = "", plainTextContent = "")
+    )
+
+    @Before
+    fun setup() {
+        context = ApplicationProvider.getApplicationContext()
+        // Clear any old prefs to ensure a clean slate for each test
+        val prefs = context.getSharedPreferences("epub_reader_bookmarks", Context.MODE_PRIVATE)
+        prefs.edit().clear().apply()
+    }
+
+    @Test
+    fun loadBookmarks_withValidJson_parsesCorrectly() {
+        val bookmark1 = JSONObject().apply {
+            put("cfi", "/4/2:10")
+            put("chapterTitle", "Chapter 1")
+            put("snippet", "A snippet of text")
+            put("chapterIndex", 0)
+        }
+        val bookmark2 = JSONObject().apply {
+            put("cfi", "/6/4:22")
+            put("chapterTitle", "Chapter 2")
+            put("snippet", "Another snippet")
+            put("chapterIndex", 1)
+        }
+        val bookmarksJson = JSONArray(listOf(bookmark1.toString(), bookmark2.toString())).toString()
+
+        val bookmarks = loadBookmarks(context, testBookTitle, chapters, bookmarksJson)
+
+        assertThat(bookmarks).hasSize(2)
+        assertThat(bookmarks).contains(
+            Bookmark(
+                cfi = "/4/2:10",
+                chapterTitle = "Chapter 1",
+                snippet = "A snippet of text",
+                pageInChapter = null,
+                totalPagesInChapter = null,
+                chapterIndex = 0
+            )
+        )
+    }
+
+    @Test
+    fun loadBookmarks_withInvalidJson_returnsEmptySet() {
+        val invalidJson = "[{\"cfi\": \"/4/2:10\", snippet: \"invalid json\"}]" // snippet value not in quotes
+        val bookmarks = loadBookmarks(context, testBookTitle, chapters, invalidJson)
+        assertThat(bookmarks).isEmpty()
+    }
+
+    @Test
+    fun loadBookmarks_withMissingChapterIndex_calculatesItFromTitle() {
+        val bookmark1 = JSONObject().apply {
+            put("cfi", "/6/4:22")
+            put("chapterTitle", "Chapter 2") // This should map to index 1
+            put("snippet", "Another snippet")
+        }
+        val bookmarksJson = JSONArray(listOf(bookmark1.toString())).toString()
+
+        val bookmarks = loadBookmarks(context, testBookTitle, chapters, bookmarksJson)
+
+        assertThat(bookmarks).hasSize(1)
+        val loadedBookmark = bookmarks.first()
+        assertThat(loadedBookmark.chapterIndex).isEqualTo(1)
+        assertThat(loadedBookmark.chapterTitle).isEqualTo("Chapter 2")
+    }
+
+    @Test
+    fun loadBookmarks_withNullJson_fallsBackToSharedPreferences() {
+        // This test doesn't write to shared prefs, so it should return an empty set.
+        val bookmarks = loadBookmarks(context, testBookTitle, chapters, null)
+        assertThat(bookmarks).isEmpty()
+    }
+}

app/src/androidTest/java/com/aryan/reader/epubreader/EpubReaderLogicTest.kt

@@ -0,0 +1,204 @@
+// app/src/androidTest/java/com/aryan/reader/epubreader/EpubReaderLogicTest.kt
+package com.aryan.reader.epubreader
+
+import android.content.Context
+import timber.log.Timber
+import androidx.compose.ui.text.AnnotatedString
+import androidx.compose.ui.text.SpanStyle
+import androidx.compose.ui.text.buildAnnotatedString
+import androidx.compose.ui.text.font.FontWeight
+import androidx.test.core.app.ApplicationProvider
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.aryan.reader.SearchResult
+import com.aryan.reader.epub.EpubBook
+import com.aryan.reader.epub.EpubChapter
+import com.google.common.truth.Truth.assertThat
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.runBlocking
+import kotlinx.coroutines.withContext
+import org.jsoup.Jsoup
+import org.junit.After
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+import java.io.File
+import kotlin.math.max
+import kotlin.math.min
+
+@RunWith(AndroidJUnit4::class)
+class EpubReaderLogicTest {
+
+    private lateinit var context: Context
+    private lateinit var testDir: File
+    private lateinit var mockEpubBook: EpubBook
+
+    @Before
+    fun setup() {
+        context = ApplicationProvider.getApplicationContext()
+        testDir = File(context.cacheDir, "test_epub").apply { mkdirs() }
+
+        // Create dummy chapter files
+        val chapter1File = File(testDir, "chapter1.html")
+        chapter1File.writeText("<html><body><p>A simple Test case.</p></body></html>")
+
+        val chapter2File = File(testDir, "chapter2.html")
+        chapter2File.writeText("<html><body><p>Another test case here.</p><p>The word Test appears twice.</p></body></html>")
+
+        mockEpubBook = EpubBook(
+            fileName = "test.epub",
+            title = "Test Book",
+            author = "Tester",
+            language = "en",
+            coverImage = null,
+            extractionBasePath = testDir.absolutePath,
+            chapters = listOf(
+                EpubChapter(
+                    chapterId = "ch1",
+                    absPath = chapter1File.absolutePath,
+                    title = "Chapter 1",
+                    htmlFilePath = "chapter1.html",
+                    plainTextContent = "",
+                    htmlContent = ""
+                ),
+                EpubChapter(
+                    chapterId = "ch2",
+                    absPath = chapter2File.absolutePath,
+                    title = "Chapter 2",
+                    htmlFilePath = "chapter2.html",
+                    plainTextContent = "",
+                    htmlContent = ""
+                )
+            )
+        )
+    }
+
+    @After
+    fun tearDown() {
+        testDir.deleteRecursively()
+    }
+
+    private suspend fun searchEpub(book: EpubBook, query: String): List<SearchResult> {
+        val TAG = "EpubReaderLogicTest"
+        Timber.d("Starting search for query: '$query'")
+        return withContext(Dispatchers.IO) {
+            val results = mutableListOf<SearchResult>()
+            book.chapters.forEachIndexed { chapterIndex, chapter ->
+                try {
+                    val fullPath = "${book.extractionBasePath}/${chapter.htmlFilePath}"
+                    Timber.d("Chapter ${chapterIndex + 1}: Checking path '$fullPath'")
+                    val htmlFile = File(fullPath)
+                    if (!htmlFile.exists()) {
+                        Timber.e("File does not exist: $fullPath")
+                        return@forEachIndexed
+                    }
+
+                    val doc = Jsoup.parse(htmlFile, "UTF-8")
+                    val bodyChildren = doc.body().children().toList()
+                    val chunks = bodyChildren.chunked(20)
+
+                    chunks.forEachIndexed { chunkIndex, chunkOfElements ->
+                        val chunkHtml = chunkOfElements.joinToString(separator = "\n") { it.outerHtml() }
+                        val content = Jsoup.parse(chunkHtml).text()
+                        var lastIndex = -1
+
+                        while (true) {
+                            lastIndex = content.indexOf(query, startIndex = lastIndex + 1, ignoreCase = true)
+                            if (lastIndex == -1) break
+
+                            Timber.d("Found potential match for '$query' at index $lastIndex.")
+                            val isWordStart = lastIndex == 0 || !content[lastIndex - 1].isLetterOrDigit()
+                            Timber.d("Is it a word start? -> $isWordStart")
+                            if (isWordStart) {
+                                Timber.d("Match is a word start. Adding to results.")
+                                val snippetStart = max(0, lastIndex - 35)
+                                val snippetEnd = min(content.length, lastIndex + query.length + 35)
+                                val rawSnippet = content.substring(snippetStart, snippetEnd)
+                                val annotatedSnippet = buildAnnotatedString {
+                                    append(rawSnippet)
+                                    val highlightStart = content.indexOf(query, lastIndex, ignoreCase = true) - snippetStart
+                                    val highlightEnd = highlightStart + query.length
+                                    addStyle(
+                                        style = SpanStyle(fontWeight = FontWeight.Bold),
+                                        start = highlightStart,
+                                        end = highlightEnd
+                                    )
+                                }
+                                results.add(
+                                    SearchResult(
+                                        locationInSource = chapterIndex,
+                                        locationTitle = chapter.title,
+                                        snippet = annotatedSnippet,
+                                        query = query,
+                                        occurrenceIndexInLocation = results.count { it.locationInSource == chapterIndex },
+                                        chunkIndex = chunkIndex
+                                    )
+                                )
+                            }
+                        }
+                    }
+                } catch (e: Exception) {
+                    Timber.e("Error during search in chapter ${chapter.title}", e)
+                    throw e
+                }
+            }
+            Timber.d("Search finished. Total results found: ${results.size}")
+            results
+        }
+    }
+
+    @Test
+    fun search_findsCorrectResults() = runBlocking {
+        val results = searchEpub(mockEpubBook, "case")
+        assertThat(results).hasSize(2)
+        assertThat(results.count { it.locationTitle == "Chapter 1" }).isEqualTo(1)
+        assertThat(results.count { it.locationTitle == "Chapter 2" }).isEqualTo(1)
+    }
+
+    @Test
+    fun search_isCaseInsensitive() = runBlocking {
+        val results = searchEpub(mockEpubBook, "test")
+        assertThat(results).hasSize(3)
+        assertThat(results[0].locationTitle).isEqualTo("Chapter 1")
+        assertThat(results[1].locationTitle).isEqualTo("Chapter 2")
+        assertThat(results[2].locationTitle).isEqualTo("Chapter 2")
+    }
+
+    @Test
+    fun search_noResultsFound() = runBlocking {
+        val results = searchEpub(mockEpubBook, "nonexistent")
+        assertThat(results).isEmpty()
+    }
+
+    @Test
+    fun search_createsCorrectSnippetHighlight() = runBlocking {
+        val query = "Test"
+        mockEpubBook.chapters.first()
+        val content = "A simple Test case."
+        val annotatedString = buildAnnotatedStringWithHighlight(content, query)
+
+        val spanStyles = annotatedString.spanStyles
+        assertThat(spanStyles).hasSize(1)
+
+        val style = spanStyles.first().item
+        assertThat(style.fontWeight).isEqualTo(FontWeight.Bold)
+
+        val start = spanStyles.first().start
+        val end = spanStyles.first().end
+        assertThat(annotatedString.substring(start, end)).isEqualTo(query)
+    }
+
+    @Suppress("SameParameterValue")
+    private fun buildAnnotatedStringWithHighlight(content: String, query: String): AnnotatedString {
+        return buildAnnotatedString {
+            append(content)
+            val highlightStart = content.indexOf(query, ignoreCase = true)
+            if (highlightStart != -1) {
+                addStyle(
+                    style = SpanStyle(fontWeight = FontWeight.Bold),
+                    start = highlightStart,
+                    end = highlightStart + query.length
+                )
+            }
+        }
+    }
+}

app/src/androidTest/java/com/aryan/reader/epubreader/MainDispatcherRule.kt

@@ -0,0 +1,27 @@
+package com.aryan.reader.epubreader
+
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.test.TestDispatcher
+import kotlinx.coroutines.test.UnconfinedTestDispatcher
+import kotlinx.coroutines.test.resetMain
+import kotlinx.coroutines.test.setMain
+import org.junit.rules.TestWatcher
+import org.junit.runner.Description
+
+/**
+ * A JUnit TestRule that sets the Main dispatcher to a TestDispatcher for the duration of a test.
+ * This allows tests to execute coroutines on the Main dispatcher without needing a real Android environment.
+ */
+@OptIn(ExperimentalCoroutinesApi::class)
+class MainDispatcherRule(
+    private val testDispatcher: TestDispatcher = UnconfinedTestDispatcher()
+) : TestWatcher() {
+    override fun starting(description: Description) {
+        Dispatchers.setMain(testDispatcher)
+    }
+
+    override fun finished(description: Description) {
+        Dispatchers.resetMain()
+    }
+}

app/src/androidTest/java/com/aryan/reader/paginatedreader/CssParserTest.kt

@@ -0,0 +1,336 @@
+// CssParserTest.kt
+package com.aryan.reader.paginatedreader
+
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.isSpecified
+import androidx.compose.ui.text.font.FontStyle
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.style.TextAlign
+import androidx.compose.ui.text.style.TextDecoration
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.em
+import com.google.common.truth.Truth.assertThat
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import org.junit.Test
+import org.junit.runner.RunWith
+
+@RunWith(AndroidJUnit4::class)
+class CssParserTest {
+
+    @Test
+    fun parseColor_handlesNamedColorsCorrectly() {
+        assertThat(CssParser.parseColor("red")).isEqualTo(Color.Red)
+        assertThat(CssParser.parseColor("black")).isEqualTo(Color.Black)
+        assertThat(CssParser.parseColor("transparent")).isEqualTo(Color.Transparent)
+    }
+
+    @Test
+    fun parseColor_handles3DigitHexCodes() {
+        assertThat(CssParser.parseColor("#F0C")).isEqualTo(Color(0xFFFF00CC))
+    }
+
+    @Test
+    fun parseColor_handles6DigitHexCodes() {
+        assertThat(CssParser.parseColor("#FF00CC")).isEqualTo(Color(0xFFFF00CC))
+    }
+
+    @Test
+    fun parseColor_handles8DigitHexCodes() {
+        assertThat(CssParser.parseColor("#80FF00CC")).isEqualTo(Color(0x80FF00CC))
+    }
+
+    @Test
+    fun parseColor_handlesRgbFunction() {
+        assertThat(CssParser.parseColor("rgb(255, 0, 204)")).isEqualTo(Color(255, 0, 204))
+    }
+
+    @Test
+    fun parseColor_handlesRgbaFunction() {
+        assertThat(CssParser.parseColor("rgba(255, 0, 204, 0.5)")).isEqualTo(Color(255, 0, 204, 128))
+    }
+
+    @Test
+    fun parseColor_returnsNullForInvalidInput() {
+        assertThat(CssParser.parseColor("not a color")).isNull()
+        assertThat(CssParser.parseColor("#12345")).isNull()
+        assertThat(CssParser.parseColor("rgb(1,2)")).isNull()
+    }
+
+    private val dummyConstraints = androidx.compose.ui.unit.Constraints()
+    private val baseFontSize = 16f
+    private val density = 1f
+
+    @Test
+    fun parse_handlesSimpleRule() {
+        val css = "p { color: red; }"
+        val result = CssParser.parse(css, null, baseFontSize, density, dummyConstraints, isDarkTheme = false)
+        val rules = result.rules.byTag["p"]
+        assertThat(rules).hasSize(1)
+        assertThat(rules?.first()?.style?.spanStyle?.color).isEqualTo(Color.Red)
+    }
+
+    @Test
+    fun parse_handlesMultipleSelectors() {
+        val css = "h1, h2, h3 { font-weight: bold; }"
+        val result = CssParser.parse(css, null, baseFontSize, density, dummyConstraints, isDarkTheme = false)
+        assertThat(result.rules.byTag["h1"]).hasSize(1)
+        assertThat(result.rules.byTag["h2"]).hasSize(1)
+        assertThat(result.rules.byTag["h3"]).hasSize(1)
+        assertThat(result.rules.byTag["h1"]?.first()?.style?.spanStyle?.fontWeight).isEqualTo(FontWeight.Bold)
+        assertThat(result.rules.byTag["h2"]?.first()?.style?.spanStyle?.fontWeight).isEqualTo(FontWeight.Bold)
+        assertThat(result.rules.byTag["h3"]?.first()?.style?.spanStyle?.fontWeight).isEqualTo(FontWeight.Bold)
+    }
+
+    @Test
+    fun parse_handlesImportantRules() {
+        val css = "p { color: red !important; }"
+        val result = CssParser.parse(css, null, baseFontSize, density, dummyConstraints, isDarkTheme = false)
+        val importantRule = result.rules.byTag["p"]?.find { it.selector.specificity >= 10000 }
+        assertThat(importantRule).isNotNull()
+        assertThat(importantRule!!.style.spanStyle.color).isEqualTo(Color.Red)
+        val normalRule = result.rules.byTag["p"]?.find { it.selector.specificity < 10000 }
+        assertThat(normalRule).isNull()
+    }
+
+    @Test
+    fun parse_createsBothNormalAndImportantRulesWhenMixed() {
+        val css = "p { color: blue; background-color: white !important; }"
+        val result = CssParser.parse(css, null, baseFontSize, density, dummyConstraints, isDarkTheme = false)
+        val rules = result.rules.byTag["p"]
+        assertThat(rules).hasSize(2)
+
+        val importantRule = rules?.find { it.selector.specificity >= 10000 }
+        assertThat(importantRule).isNotNull()
+        assertThat(importantRule!!.style.blockStyle.backgroundColor).isEqualTo(Color.White)
+        assertThat(importantRule.style.spanStyle.color.isSpecified).isFalse()
+
+        val normalRule = rules.find { it.selector.specificity < 10000 }
+        assertThat(normalRule).isNotNull()
+        assertThat(normalRule!!.style.spanStyle.color).isEqualTo(Color.Blue)
+        assertThat(normalRule.style.blockStyle.backgroundColor.isSpecified).isFalse()
+    }
+
+    @Test
+    fun parse_extractsFontFaceRulesAndResolvesPath() {
+        val css = """
+        @font-face {
+            font-family: "MyCustomFont";
+            src: url("../fonts/myfont.ttf");
+            font-weight: bold;
+        }
+        p { color: black; }
+        """.trimIndent()
+        val result = CssParser.parse(css, "/some/path/style.css", baseFontSize, density, dummyConstraints, isDarkTheme = false)
+        assertThat(result.rules.byTag).containsKey("p")
+        assertThat(result.fontFaces).hasSize(1)
+        val fontFace = result.fontFaces.first()
+        assertThat(fontFace.fontFamily).isEqualTo("mycustomfont")
+        assertThat(fontFace.src).isEqualTo("/some/fonts/myfont.ttf")
+        assertThat(fontFace.fontWeight).isEqualTo(FontWeight.Bold)
+        assertThat(fontFace.fontStyle).isEqualTo(FontStyle.Normal)
+    }
+
+    @Test
+    fun parse_handlesFontFaceWithDataUri() {
+        val dataUri = "data:font/truetype;base64,AAEAAA..."
+        val css = """
+        @font-face {
+            font-family: 'MyDataFont';
+            src: url('$dataUri');
+        }
+        """.trimIndent()
+        val result = CssParser.parse(css, "/css/style.css", baseFontSize, density, dummyConstraints, isDarkTheme = false)
+        assertThat(result.fontFaces).hasSize(1)
+        assertThat(result.fontFaces.first().src).isEqualTo(dataUri)
+    }
+
+    @Test
+    fun parse_sanitizesPseudoClassesFromSelectors() {
+        val css = "a:hover, p::first-line, button:focus { color: red; }"
+        val result = CssParser.parse(css, null, baseFontSize, density, dummyConstraints, isDarkTheme = false)
+        assertThat(result.rules.byTag.keys).containsExactly("a", "p", "button")
+    }
+
+    @Test
+    fun parse_calculatesSpecificityCorrectly() {
+        val css = """
+        #myId { color: red; } /* 100 */
+        p.myClass { color: green; } /* 11 */
+        p { color: blue; } /* 1 */
+        div p { color: yellow; } /* 2 */
+        """.trimIndent()
+        val result = CssParser.parse(css, null, baseFontSize, density, dummyConstraints, isDarkTheme = false)
+        val idRule = result.rules.byId["myId"]?.first()
+        val classRule = result.rules.otherComplex.find { it.selector.selector == "p.myClass" }
+        val elementRule = result.rules.byTag["p"]?.first()
+        val descendantRule = result.rules.otherComplex.find { it.selector.selector == "div p" }
+
+        assertThat(idRule?.selector?.specificity).isEqualTo(100)
+        assertThat(classRule?.selector?.specificity).isEqualTo(11)
+        assertThat(elementRule?.selector?.specificity).isEqualTo(1)
+        assertThat(descendantRule?.selector?.specificity).isEqualTo(2)
+    }
+
+    @Test
+    fun parse_ignoresComments() {
+        val css = """
+        /* This is a comment */
+        p {
+            color: /* another comment */ blue; /* block comment */
+        }
+        """.trimIndent()
+        val result = CssParser.parse(css, null, baseFontSize, density, dummyConstraints, isDarkTheme = false)
+        val rules = result.rules.byTag["p"]
+        assertThat(rules).hasSize(1)
+        assertThat(rules?.first()?.style?.spanStyle?.color).isEqualTo(Color.Blue)
+    }
+
+    @Test
+    fun parse_handlesBorderShorthand() {
+        val css = "div { border: 2px solid red; }"
+        val result = CssParser.parse(css, null, baseFontSize, density, dummyConstraints, isDarkTheme = false)
+        val style = result.rules.byTag["div"]?.first()?.style?.blockStyle
+        assertThat(style?.border).isNotNull()
+        assertThat(style?.border?.width).isEqualTo(2.dp)
+        assertThat(style?.border?.style).isEqualTo("solid")
+        assertThat(style?.border?.color).isEqualTo(Color.Red)
+    }
+
+    @Test
+    fun parse_handlesMarginAndPaddingShorthand() {
+        val css = "p { margin: 10px 20px; padding: 1em 2em 3em 4em; }"
+        val result = CssParser.parse(css, null, baseFontSize, density, dummyConstraints, isDarkTheme = false)
+        val style = result.rules.byTag["p"]?.first()?.style?.blockStyle
+        assertThat(style?.margin?.top).isEqualTo(10.dp)
+        assertThat(style?.margin?.right).isEqualTo(20.dp)
+        assertThat(style?.margin?.bottom).isEqualTo(10.dp)
+        assertThat(style?.margin?.left).isEqualTo(20.dp)
+
+        assertThat(style?.padding?.top).isEqualTo(16.dp) // 1em
+        assertThat(style?.padding?.right).isEqualTo(32.dp) // 2em
+        assertThat(style?.padding?.bottom).isEqualTo(48.dp) // 3em
+        assertThat(style?.padding?.left).isEqualTo(64.dp) // 4em
+    }
+
+    @Test
+    fun parse_handlesFontSizeWithEmUnits() {
+        val css = "p { font-size: 1.2em; }"
+        val result = CssParser.parse(css, null, baseFontSize, density, dummyConstraints, isDarkTheme = false)
+        val style = result.rules.byTag["p"]?.first()?.style
+        assertThat(style?.fontSize?.isEm).isTrue()
+        assertThat(style?.fontSize?.value).isEqualTo(1.2f)
+    }
+
+    @Test
+    fun parse_optimizationCategorizesRulesCorrectly() {
+        val css = """
+            p { color: blue; }
+            .myClass { color: green; }
+            #myId { color: red; }
+            div > p { color: yellow; }
+        """.trimIndent()
+        val result = CssParser.parse(css, null, baseFontSize, density, dummyConstraints, isDarkTheme = false)
+        assertThat(result.rules.byTag).containsKey("p")
+        assertThat(result.rules.byClass).containsKey("myClass")
+        assertThat(result.rules.byId).containsKey("myId")
+        assertThat(result.rules.otherComplex).hasSize(1)
+        assertThat(result.rules.otherComplex.first().selector.selector).isEqualTo("div > p")
+    }
+
+    @Test
+    fun parse_mediaQueryAppliesDarkThemeRules() {
+        val css = """
+            p { color: black; }
+            @media (prefers-color-scheme: dark) {
+                p { color: white; }
+            }
+        """.trimIndent()
+        val lightResult = CssParser.parse(css, null, baseFontSize, density, dummyConstraints, isDarkTheme = false)
+        assertThat(lightResult.rules.byTag["p"]?.first()?.style?.spanStyle?.color).isEqualTo(Color.Black)
+
+        val darkResult = CssParser.parse(css, null, baseFontSize, density, dummyConstraints, isDarkTheme = true)
+        assertThat(darkResult.rules.byTag["p"]?.last()?.style?.spanStyle?.color).isEqualTo(Color.White)
+    }
+
+    @Test
+    fun parse_fontFaceSelectsPreferredSourceFormat() {
+        val css = """
+        @font-face {
+            font-family: "MyFont";
+            src: url("font.woff2") format("woff2"),
+                 url("font.otf") format("opentype"),
+                 url("font.ttf") format("truetype");
+        }
+        """.trimIndent()
+        val result = CssParser.parse(css, "/css/style.css", baseFontSize, density, dummyConstraints, isDarkTheme = false)
+        assertThat(result.fontFaces).hasSize(1)
+        assertThat(result.fontFaces.first().src).isEqualTo("/css/font.otf")
+    }
+
+    @Test
+    fun parse_propertiesHandlesVariousUnitsAndValues() {
+        val css = """
+            p {
+                font-size: 150%;
+                text-transform: uppercase;
+                text-decoration: underline;
+                text-align: center;
+                page-break-inside: avoid;
+                margin: 0 auto;
+            }
+        """.trimIndent()
+        val result = CssParser.parse(css, null, baseFontSize, density, dummyConstraints, isDarkTheme = false)
+        val style = result.rules.byTag["p"]?.first()?.style
+        assertThat(style?.fontSize).isEqualTo(1.5.em)
+        assertThat(style?.textTransform).isEqualTo("uppercase")
+        assertThat(style?.spanStyle?.textDecoration).isEqualTo(TextDecoration.Underline)
+        assertThat(style?.paragraphStyle?.textAlign).isEqualTo(TextAlign.Center)
+        assertThat(style?.blockStyle?.pageBreakInsideAvoid).isTrue()
+        assertThat(style?.blockStyle?.horizontalAlign).isEqualTo("center")
+    }
+
+    @Test
+    fun parse_themeAdaptationAdaptsColorsCorrectlyForDarkTheme() {
+        val css = "p { color: #111; background-color: #EEE; }" // very dark text, very light bg
+        val result = CssParser.parse(css, null, baseFontSize, density, dummyConstraints, isDarkTheme = true)
+        val style = result.rules.byTag["p"]?.first()?.style
+
+        assertThat(style?.spanStyle?.color).isEqualTo(Color.White.copy(alpha = 0.87f))
+        assertThat(style?.blockStyle?.backgroundColor).isEqualTo(Color.Transparent)
+    }
+
+    @Test
+    fun parse_dataUriWithSemicolonParsesCorrectly() {
+        val dataUri = "data:font/opentype;base64,d09GMgABAAAAAAPs...;something=else"
+        val css = """
+        @font-face {
+            font-family: 'MyDataFont';
+            src: url('$dataUri');
+        }
+        p { color: red; }
+        """.trimIndent()
+        val result = CssParser.parse(css, null, baseFontSize, density, dummyConstraints, isDarkTheme = false)
+        assertThat(result.fontFaces).hasSize(1)
+        assertThat(result.fontFaces.first().src).isEqualTo(dataUri)
+        assertThat(result.rules.byTag).containsKey("p")
+    }
+
+    @Test
+    fun parse_textEmphasisParsesCorrectly() {
+        val css = "p { -epub-text-emphasis-style: filled dot; -epub-text-emphasis-color: red; }"
+        val result = CssParser.parse(css, null, baseFontSize, density, dummyConstraints, isDarkTheme = false)
+        val emphasis = result.rules.byTag["p"]?.first()?.style?.textEmphasis
+        assertThat(emphasis).isNotNull()
+        assertThat(emphasis?.style).isEqualTo("dot")
+        assertThat(emphasis?.fill).isEqualTo("filled")
+        assertThat(emphasis?.color).isEqualTo(Color.Red)
+    }
+
+    @Test
+    fun parse_lineHeightClampsSmallEmValues() {
+        val css = "p { line-height: 1.1; }" // This is treated as 1.1em
+        val result = CssParser.parse(css, null, baseFontSize, density, dummyConstraints, isDarkTheme = false)
+        val style = result.rules.byTag["p"]?.first()?.style
+        assertThat(style?.paragraphStyle?.lineHeight).isEqualTo(2.0.em)
+    }
+}

app/src/androidTest/java/com/aryan/reader/paginatedreader/HtmlParserTest.kt

@@ -0,0 +1,375 @@
+// HtmlParserTest.kt
+package com.aryan.reader.paginatedreader
+
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.text.TextStyle
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.style.TextAlign
+import androidx.compose.ui.unit.Constraints
+import androidx.compose.ui.unit.Density
+import androidx.compose.ui.unit.sp
+import com.google.common.truth.Truth.assertThat
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import androidx.test.platform.app.InstrumentationRegistry
+import org.junit.Test
+import org.junit.runner.RunWith
+import java.io.File
+
+@RunWith(AndroidJUnit4::class)
+class HtmlParserTest {
+
+    // region Test Setup
+    private val defaultTextStyle = TextStyle.Default.copy(fontSize = 16.sp, color = Color.Black)
+    private val defaultDensity = Density(density = 1f, fontScale = 1f)
+    private val defaultConstraints = Constraints(maxWidth = 1000)
+    private val defaultChapterPath = "OEBPS/chapter1.xhtml"
+    private val defaultExtractionPath = InstrumentationRegistry.getInstrumentation().targetContext.cacheDir.absolutePath + "/epub_test/"
+
+    private fun parse(
+        html: String,
+        cssRules: OptimizedCssRules? = null,
+        mathSvgCache: Map<String, String> = emptyMap()
+    ): List<SemanticBlock> {
+        val userAgentRules = CssParser.parse(
+            cssContent = UserAgentStylesheet.default,
+            cssPath = null,
+            baseFontSizeSp = defaultTextStyle.fontSize.value,
+            density = defaultDensity.density,
+            constraints = defaultConstraints,
+            isDarkTheme = false // This is for CSS parsing, not the semantic parser
+        ).rules
+
+        val allRules = cssRules?.let { userAgentRules.merge(it) } ?: userAgentRules
+
+        return htmlToSemanticBlocks(
+            html = "<body>$html</body>", // Wrap in body to match real usage
+            cssRules = allRules, // Use the combined list of rules
+            textStyle = defaultTextStyle,
+            chapterAbsPath = defaultChapterPath,
+            extractionBasePath = defaultExtractionPath,
+            density = defaultDensity,
+            fontFamilyMap = emptyMap(),
+            constraints = defaultConstraints,
+            mathSvgCache = mathSvgCache
+        )
+    }
+
+    @Test
+    fun htmlToSemanticBlocks_simpleParagraphTag_createsSemanticParagraph() {
+        val blocks = parse("<p>Hello World</p>")
+
+        assertThat(blocks).hasSize(1)
+        val block = blocks.first()
+        assertThat(block).isInstanceOf(SemanticParagraph::class.java)
+        val pBlock = block as SemanticParagraph
+        assertThat(pBlock.text).isEqualTo("Hello World")
+    }
+
+    @Test
+    fun htmlToSemanticBlocks_headerTag_createsSemanticHeaderWithCorrectLevel() {
+        val blocks = parse("<h2>Chapter 2</h2>")
+
+        assertThat(blocks).hasSize(1)
+        val block = blocks.first()
+        assertThat(block).isInstanceOf(SemanticHeader::class.java)
+        val hBlock = block as SemanticHeader
+        assertThat(hBlock.text).isEqualTo("Chapter 2")
+        assertThat(hBlock.level).isEqualTo(2)
+    }
+
+    @Test
+    fun htmlToSemanticBlocks_nestedTag_inheritsStyleFromParent() {
+        val blocks = parse("<div style=\"color: #FF0000;\"><p>This text should be red.</p></div>")
+
+        assertThat(blocks).hasSize(1)
+        val pBlock = blocks.first() as SemanticParagraph
+        assertThat(pBlock.text).isEqualTo("This text should be red.")
+        assertThat(pBlock.style.spanStyle.color).isEqualTo(Color.Red)
+    }
+
+    @Test
+    fun htmlToSemanticBlocks_inlineStyle_overridesCssRule() {
+        val css = "p { color: red; }"
+        val cssRules = CssParser.parse(css, null, 16f, 1f, defaultConstraints, isDarkTheme = false).rules
+
+        val blocks = parse("<p style=\"color: green;\">I am green.</p>", cssRules = cssRules)
+
+        assertThat(blocks).hasSize(1)
+        val pBlock = blocks.first() as SemanticParagraph
+        val blockStyle = pBlock.style.spanStyle
+        assertThat(blockStyle.color).isEqualTo(Color.Green)
+    }
+
+    @Test
+    fun htmlToSemanticBlocks_elementWithDisplayNone_isNotIncludedInOutput() {
+        val blocks = parse("<p>Visible</p><p style=\"display: none;\">Invisible</p>")
+
+        assertThat(blocks).hasSize(1)
+        assertThat((blocks.first() as SemanticParagraph).text).isEqualTo("Visible")
+    }
+
+    @Test
+    fun htmlToSemanticBlocks_imageWithNonExistentPath_producesNoBlock() {
+        // This tests the negative path where resolveImagePath returns null
+        val blocks = parse("<img src=\"non/existent/path.jpg\" />")
+
+        assertThat(blocks).isEmpty()
+    }
+
+    @Test
+    fun htmlToSemanticBlocks_unorderedList_createsSemanticList() {
+        val blocks = parse("<ul><li>Item 1</li><li>Item 2</li></ul>")
+
+        assertThat(blocks).hasSize(1)
+        val listBlock = blocks.first() as SemanticList
+        assertThat(listBlock.isOrdered).isFalse()
+        assertThat(listBlock.items).hasSize(2)
+
+        val item1 = listBlock.items[0]
+        val item2 = listBlock.items[1]
+
+        assertThat(item1.text).isEqualTo("Item 1")
+        assertThat(item2.text).isEqualTo("Item 2")
+    }
+
+    @Test
+    fun htmlToSemanticBlocks_orderedListWithCssType_createsCorrectSemanticList() {
+        val css = "ol { list-style-type: lower-roman; }"
+        val cssRules = CssParser.parse(css, null, 16f, 1f, defaultConstraints, isDarkTheme = false).rules
+
+        val blocks = parse("<ol><li>Item 1</li><li>Item 2</li></ol>", cssRules = cssRules)
+
+        assertThat(blocks).hasSize(1)
+        val listBlock = blocks.first() as SemanticList
+        assertThat(listBlock.isOrdered).isTrue()
+        assertThat(listBlock.style.blockStyle.listStyleType).isEqualTo("lower-roman")
+        assertThat(listBlock.items).hasSize(2)
+    }
+
+
+    @Test
+    fun htmlToSemanticBlocks_table_createsSemanticTableWithCorrectStructure() {
+        val html = """
+        <table>
+            <tr>
+                <th>Header 1</th>
+                <th style="text-align: right;">Header 2</th>
+            </tr>
+            <tr>
+                <td>Data A</td>
+                <td>Data B</td>
+            </tr>
+        </table>
+    """.trimIndent()
+
+        val blocks = parse(html)
+
+        assertThat(blocks).hasSize(1)
+        val tableBlock = blocks.first() as SemanticTable
+        assertThat(tableBlock.rows).hasSize(2)
+
+        // Verify Header Row
+        val headerRow = tableBlock.rows[0]
+        assertThat(headerRow).hasSize(2)
+        assertThat(headerRow[0].isHeader).isTrue()
+        assertThat((headerRow[0].content.first() as SemanticParagraph).text).isEqualTo("Header 1")
+        assertThat(headerRow[1].isHeader).isTrue()
+        assertThat((headerRow[1].content.first() as SemanticParagraph).text).isEqualTo("Header 2")
+        assertThat(headerRow[1].style.paragraphStyle.textAlign).isEqualTo(TextAlign.End)
+
+        // Verify Data Row
+        val dataRow = tableBlock.rows[1]
+        assertThat(dataRow).hasSize(2)
+        assertThat(dataRow[0].isHeader).isFalse()
+        assertThat((dataRow[0].content.first() as SemanticParagraph).text).isEqualTo("Data A")
+        assertThat(dataRow[1].isHeader).isFalse()
+        assertThat((dataRow[1].content.first() as SemanticParagraph).text).isEqualTo("Data B")
+    }
+
+    @Test
+    fun htmlToSemanticBlocks_textTransformations_areAppliedCorrectly() {
+        val blocks = parse("<p style=\"text-transform: uppercase;\">hello world</p>")
+
+        assertThat(blocks).hasSize(1)
+        val pBlock = blocks.first() as SemanticParagraph
+        // The transformation is applied during text building
+        assertThat(pBlock.text).isEqualTo("HELLO WORLD")
+    }
+
+    @Test
+    fun htmlToSemanticBlocks_complexInlineFormatting_isPreserved() {
+        val html = "<p>This is <b>bold</b> and <i>italic</i> text.</p>"
+        val blocks = parse(html)
+
+        assertThat(blocks).hasSize(1)
+        val pBlock = blocks.first() as SemanticParagraph
+
+        assertThat(pBlock.text).isEqualTo("This is bold and italic text.")
+
+        // Find the range for "bold" and check its style
+        val boldRange = pBlock.spans.find { pBlock.text.substring(it.start, it.end) == "bold" }
+        assertThat(boldRange).isNotNull()
+        assertThat(boldRange!!.style.spanStyle.fontWeight).isEqualTo(FontWeight.Bold)
+
+        // Find the range for "italic" and check its style
+        val italicRange =
+            pBlock.spans.find { pBlock.text.substring(it.start, it.end) == "italic" }
+        assertThat(italicRange).isNotNull()
+        assertThat(italicRange!!.style.spanStyle.fontStyle).isEqualTo(androidx.compose.ui.text.font.FontStyle.Italic)
+    }
+
+    @Test
+    fun htmlToSemanticBlocks_imageWithExistingPath_createsSemanticImageWithCorrectPath() {
+        // SETUP
+        val imageRelativeSrc = "../images/test.jpg"
+        val chapterParentDir = File(defaultChapterPath).parent ?: ""
+        val imageFile = File(File(defaultExtractionPath, chapterParentDir), imageRelativeSrc).canonicalFile
+        imageFile.parentFile?.mkdirs()
+        imageFile.createNewFile()
+        imageFile.deleteOnExit()
+
+        // ACTION
+        val blocks = parse("<img src=\"$imageRelativeSrc\" alt=\"A test image\" />")
+
+        // ASSERT
+        assertThat(blocks).hasSize(1)
+        val block = blocks.first()
+        assertThat(block).isInstanceOf(SemanticImage::class.java)
+
+        val imageBlock = block as SemanticImage
+        assertThat(imageBlock.path).isEqualTo(imageFile.absolutePath)
+        assertThat(imageBlock.altText).isEqualTo("A test image")
+    }
+
+    @Test
+    fun htmlToSemanticBlocks_pseudoElements_areIgnoredByTheParser() {
+        val css = "p::before { content: \"Note: \"; }"
+        val cssRules = CssParser.parse(css, null, 16f, 1f, defaultConstraints, isDarkTheme = false).rules
+        val blocks = parse("<p>This is a test.</p>", cssRules = cssRules)
+
+        // The parser now ignores pseudo-elements, so only the paragraph content should be parsed.
+        assertThat(blocks).hasSize(1)
+        val pBlock = blocks[0] as SemanticParagraph
+        assertThat(pBlock.text).isEqualTo("This is a test.")
+    }
+
+    @Test
+    fun htmlToSemanticBlocks_hrWithPseudoElement_ignoresPseudoElement() {
+        val css = "hr.fancy::after { content: ''; display: block; border-bottom: 2px solid blue; }"
+        val cssRules = CssParser.parse(css, null, 16f, 1f, defaultConstraints, isDarkTheme = false).rules
+        val blocks = parse("<hr class=\"fancy\" />", cssRules = cssRules)
+
+        // The pseudo-element is ignored, so only the spacer from <hr> is created.
+        assertThat(blocks).hasSize(1)
+        assertThat(blocks[0]).isInstanceOf(SemanticSpacer::class.java)
+    }
+
+    @Test
+    fun htmlToSemanticBlocks_inlineSvg_createsSemanticMathWithCorrectContent() {
+        val svg = """
+    <svg width="100" height="100">
+        <title>My SVG</title>
+        <circle cx="50" cy="50" r="40" stroke="green" stroke-width="4" fill="yellow" />
+        <text x="50" y="50" fill="red">Hello</text>
+    </svg>
+""".trimIndent()
+        val blocks = parse(svg)
+
+        assertThat(blocks).hasSize(1)
+        val block = blocks.first()
+        assertThat(block).isInstanceOf(SemanticMath::class.java)
+
+        val mathBlock = block as SemanticMath
+        assertThat(mathBlock.altText).isEqualTo("My SVG")
+        // The parser now passes the SVG content through as-is.
+        assertThat(mathBlock.svgContent).contains("""<text x="50" y="50" fill="red">Hello</text>""")
+    }
+
+    @Test
+    fun htmlToSemanticBlocks_imgTagWithSvgSource_createsSemanticMath() {
+        // SETUP
+        val svgContent = """<svg width="10" height="10"><rect width="10" height="10" /></svg>"""
+        val svgRelativeSrc = "images/test.svg"
+        val chapterParentDir = File(defaultChapterPath).parent ?: ""
+        val svgFile = File(File(defaultExtractionPath, chapterParentDir), svgRelativeSrc).canonicalFile
+        svgFile.parentFile?.mkdirs()
+        svgFile.writeText(svgContent)
+        svgFile.deleteOnExit()
+
+        // ACTION
+        val blocks = parse("<img src=\"$svgRelativeSrc\" />")
+
+        // ASSERT
+        assertThat(blocks).hasSize(1)
+        val block = blocks.first()
+        assertThat(block).isInstanceOf(SemanticMath::class.java)
+        val mathBlock = block as SemanticMath
+        assertThat(mathBlock.svgContent).contains("<rect")
+    }
+
+    @Test
+    fun htmlToSemanticBlocks_mathPlaceholder_createsSemanticMathFromCache() {
+        val svgContent = "<svg><text>E=mc^2</text></svg>"
+        val cache = mapOf("math-123" to svgContent)
+        val blocks = parse(
+            html = """<math-placeholder id="math-123" alttext="An equation"></math-placeholder>""",
+            mathSvgCache = cache
+        )
+
+        assertThat(blocks).hasSize(1)
+        val block = blocks.first() as SemanticMath
+        assertThat(block.svgContent).isEqualTo(svgContent)
+        assertThat(block.altText).isEqualTo("An equation")
+        assertThat(block.isFromMathJax).isTrue()
+    }
+
+    @Test
+    fun htmlToSemanticBlocks_displayFlex_createsSemanticFlexContainer() {
+        val html = """
+    <div style="display: flex;">
+        <p>One</p>
+        <p>Two</p>
+    </div>
+""".trimIndent()
+        val blocks = parse(html)
+
+        assertThat(blocks).hasSize(1)
+        val block = blocks.first()
+        assertThat(block).isInstanceOf(SemanticFlexContainer::class.java)
+
+        val flexBlock = block as SemanticFlexContainer
+        assertThat(flexBlock.children).hasSize(2)
+        assertThat(flexBlock.children[0]).isInstanceOf(SemanticParagraph::class.java)
+        assertThat((flexBlock.children[0] as SemanticParagraph).text).isEqualTo("One")
+    }
+
+    @Test
+    fun htmlToSemanticBlocks_brTagInParagraph_createsNewlineCharacter() {
+        val blocks = parse("<p>Line one.<br>Line two.</p>")
+
+        assertThat(blocks).hasSize(1)
+        val pBlock = blocks.first() as SemanticParagraph
+        assertThat(pBlock.text).isEqualTo("Line one.\nLine two.")
+    }
+
+    @Test
+    fun htmlToSemanticBlocks_imageWithRootRelativePath_resolvesCorrectly() {
+        // SETUP
+        val imageRootRelativeSrc = "images/test.jpg"
+        val imageFile = File(defaultExtractionPath, imageRootRelativeSrc).canonicalFile
+        imageFile.parentFile?.mkdirs()
+        imageFile.createNewFile()
+        imageFile.deleteOnExit()
+
+        // ACTION
+        val blocks = parse("<img src=\"$imageRootRelativeSrc\" alt=\"A test image\" />")
+
+        // ASSERT
+        assertThat(blocks).hasSize(1)
+        val block = blocks.first()
+        assertThat(block).isInstanceOf(SemanticImage::class.java)
+
+        val imageBlock = block as SemanticImage
+        assertThat(imageBlock.path).isEqualTo(imageFile.absolutePath)
+    }
+}

app/src/androidTest/java/com/aryan/reader/paginatedreader/MainDispatcherRule.kt

@@ -0,0 +1,35 @@
+// MainDispatcherRule.kt
+package com.aryan.reader.paginatedreader
+
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.test.TestDispatcher
+import kotlinx.coroutines.test.UnconfinedTestDispatcher
+import kotlinx.coroutines.test.resetMain
+import kotlinx.coroutines.test.setMain
+import org.junit.rules.TestRule
+import org.junit.runner.Description
+import org.junit.runners.model.Statement
+
+/**
+ * A JUnit TestRule that sets the Main dispatcher to a TestDispatcher for the duration of a test.
+ * This allows tests to execute coroutines on the Main dispatcher without needing a real Android environment.
+ */
+@OptIn(ExperimentalCoroutinesApi::class)
+class MainDispatcherRule(
+    val testDispatcher: TestDispatcher = UnconfinedTestDispatcher()
+) : TestRule {
+    override fun apply(base: Statement, description: Description): Statement {
+        return object : Statement() {
+            @Throws(Throwable::class)
+            override fun evaluate() {
+                Dispatchers.setMain(testDispatcher)
+                try {
+                    base.evaluate()
+                } finally {
+                    Dispatchers.resetMain()
+                }
+            }
+        }
+    }
+}

app/src/androidTest/java/com/aryan/reader/paginatedreader/PaginatedReaderDataTest.kt

@@ -0,0 +1,120 @@
+// PaginatedReaderDataTest.kt
+package com.aryan.reader.paginatedreader
+
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.text.ParagraphStyle
+import androidx.compose.ui.text.SpanStyle
+import androidx.compose.ui.text.font.FontStyle
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.style.TextAlign
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import com.google.common.truth.Truth.assertThat
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import org.junit.Test
+import org.junit.runner.RunWith
+
+@RunWith(AndroidJUnit4::class)
+class PaginatedReaderDataTest {
+
+    @Test
+    fun cssStyle_mergeCorrectlyCombinesStyles() {
+        val baseStyle = CssStyle(
+            spanStyle = SpanStyle(color = Color.Black, fontWeight = FontWeight.Normal, fontSize = 16.sp),
+            paragraphStyle = ParagraphStyle(textAlign = TextAlign.Start),
+            fontFamilies = listOf("serif"),
+            display = "block"
+        )
+
+        val overrideStyle = CssStyle(
+            spanStyle = SpanStyle(color = Color.Red, fontStyle = FontStyle.Italic),
+            paragraphStyle = ParagraphStyle(textAlign = TextAlign.Center),
+            fontFamilies = listOf("sans-serif"),
+            textTransform = "uppercase"
+        )
+
+        val merged = baseStyle.merge(overrideStyle)
+
+        // Overridden properties
+        assertThat(merged.spanStyle.color).isEqualTo(Color.Red)
+        assertThat(merged.spanStyle.fontStyle).isEqualTo(FontStyle.Italic)
+        assertThat(merged.paragraphStyle.textAlign).isEqualTo(TextAlign.Center)
+        assertThat(merged.fontFamilies).containsExactly("sans-serif")
+        assertThat(merged.textTransform).isEqualTo("uppercase")
+
+        // Inherited properties
+        assertThat(merged.spanStyle.fontWeight).isEqualTo(FontWeight.Normal)
+        assertThat(merged.spanStyle.fontSize).isEqualTo(16.sp)
+        assertThat(merged.display).isEqualTo("block")
+    }
+
+    @Test
+    fun cssStyle_mergeWithEmptyOverrideDoesNotChangeBase() {
+        val baseStyle = CssStyle(
+            spanStyle = SpanStyle(color = Color.Black, fontWeight = FontWeight.Normal),
+            fontFamilies = listOf("serif")
+        )
+        val overrideStyle = CssStyle()
+
+        val merged = baseStyle.merge(overrideStyle)
+
+        assertThat(merged).isEqualTo(baseStyle)
+    }
+
+    @Test
+    fun blockStyle_mergeUsesOverrideProperties() {
+        val baseStyle = BlockStyle(
+            padding = BoxBorders(top = 10.dp, left = 10.dp),
+            margin = BoxBorders(top = 5.dp, bottom = 5.dp),
+            width = 100.dp,
+            backgroundColor = Color.White
+        )
+
+        val overrideStyle = BlockStyle(
+            padding = BoxBorders(top = 5.dp, right = 5.dp),
+            margin = BoxBorders(bottom = 10.dp, left = 10.dp),
+            width = 200.dp,
+            backgroundColor = Color.Black,
+            border = BorderStyle(width = 1.dp, color = Color.Red)
+        )
+
+        val merged = baseStyle.merge(overrideStyle)
+
+        // Padding should be from override, not additive
+        assertThat(merged.padding.top).isEqualTo(5.dp)
+        assertThat(merged.padding.left).isEqualTo(10.dp) // from base
+        assertThat(merged.padding.right).isEqualTo(5.dp)
+        assertThat(merged.padding.bottom).isEqualTo(0.dp) // from base
+
+        // Margin should be from override
+        assertThat(merged.margin.top).isEqualTo(5.dp) // from base
+        assertThat(merged.margin.bottom).isEqualTo(10.dp)
+        assertThat(merged.margin.left).isEqualTo(10.dp)
+        assertThat(merged.margin.right).isEqualTo(0.dp) // from base
+
+        // Other properties
+        assertThat(merged.width).isEqualTo(200.dp)
+        assertThat(merged.backgroundColor).isEqualTo(Color.Black)
+        assertThat(merged.border).isNotNull()
+        assertThat(merged.border?.width).isEqualTo(1.dp)
+    }
+
+    @Test
+    fun blockStyle_mergeWithEmptyOverrideDoesNotChangeBase() {
+        val baseStyle = BlockStyle(
+            padding = BoxBorders(10.dp, 10.dp, 10.dp, 10.dp),
+            margin = BoxBorders(5.dp, 5.dp, 5.dp, 5.dp),
+            width = 100.dp,
+            backgroundColor = Color.White
+        )
+        val overrideStyle = BlockStyle()
+
+        val merged = baseStyle.merge(overrideStyle)
+
+        assertThat(merged.padding.top).isEqualTo(10.dp)
+        assertThat(merged.margin.top).isEqualTo(5.dp)
+        assertThat(merged.width).isEqualTo(100.dp)
+        assertThat(merged.backgroundColor).isEqualTo(Color.White)
+        assertThat(merged.border).isNull()
+    }
+}

app/src/androidTest/java/com/aryan/reader/paginatedreader/PaginatedReaderViewModelTest.kt

@@ -0,0 +1,304 @@
+// PaginatedReaderViewModelTest.kt
+package com.aryan.reader.paginatedreader
+
+import android.content.Context
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableIntStateOf
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.setValue
+import androidx.compose.runtime.snapshots.Snapshot
+import androidx.compose.ui.text.TextMeasurer
+import androidx.compose.ui.text.TextStyle
+import androidx.compose.ui.unit.Constraints
+import androidx.compose.ui.unit.Density
+import androidx.test.core.app.ApplicationProvider
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.aryan.reader.SearchResult
+import com.aryan.reader.epub.EpubBook
+import com.aryan.reader.epub.EpubChapter
+import com.aryan.reader.paginatedreader.data.BookCacheDao
+import com.aryan.reader.paginatedreader.data.BookCacheDatabase
+import com.aryan.reader.paginatedreader.data.BookProcessingWorker
+import com.google.common.truth.Truth.assertThat
+import io.mockk.coEvery
+import io.mockk.every
+import io.mockk.mockk
+import io.mockk.mockkObject
+import io.mockk.unmockkAll
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.emptyFlow
+import kotlinx.coroutines.test.advanceUntilIdle
+import kotlinx.coroutines.test.runTest
+import org.junit.After
+import org.junit.Before
+import org.junit.Rule
+import org.junit.Test
+import org.junit.runner.RunWith
+
+private class FakePaginator(
+    initiallyLoading: Boolean,
+    initialPageCount: Int,
+    initialGeneration: Int
+) : IPaginator {
+    override var isLoading by mutableStateOf(initiallyLoading)
+    override var totalPageCount by mutableIntStateOf(initialPageCount)
+    override var generation by mutableIntStateOf(initialGeneration)
+    override val pageShiftRequest: Flow<Int> = emptyFlow()
+
+    var lastNavigatedHref: String? = null
+    var lastNavigatedChapter: String? = null
+
+    override fun getPageContent(pageIndex: Int): Page? = null
+    override fun getChapterPathForPage(pageIndex: Int): String? = null
+    override fun getPlainTextForChapter(chapterIndex: Int): String? = null
+
+    override fun navigateToHref(
+        currentChapterAbsPath: String,
+        href: String,
+        onNavigationComplete: (pageIndex: Int) -> Unit
+    ) {
+        lastNavigatedChapter = currentChapterAbsPath
+        lastNavigatedHref = href
+    }
+
+    override fun findPageForSearchResult(
+        result: SearchResult,
+        onResult: (Int) -> Unit
+    ) = Unit
+
+    // Add stubs for the other missing interface members
+    override fun findPageForCfi(chapterIndex: Int, cfi: String, onResult: (Int) -> Unit) = Unit
+    override fun findPageForCfiAndOffset(
+        chapterIndex: Int,
+        cfi: String,
+        charOffset: Int
+    ): Int? {
+        return null
+    }
+
+    override fun findChapterIndexForPage(pageIndex: Int): Int? = null
+    override fun getCfiForPage(pageIndex: Int): String? = null
+    override fun onUserScrolledTo(pageIndex: Int) = Unit
+}
+
+@OptIn(ExperimentalCoroutinesApi::class)
+@RunWith(AndroidJUnit4::class)
+class PaginatedReaderViewModelTest {
+
+    @get:Rule
+    val mainDispatcherRule = MainDispatcherRule()
+
+    private lateinit var viewModel: PaginatedReaderViewModel
+    private lateinit var fakePaginator: FakePaginator
+
+    @Before
+    fun setUp() {
+        viewModel = PaginatedReaderViewModel()
+        fakePaginator = FakePaginator(
+            initiallyLoading = true,
+            initialPageCount = 0,
+            initialGeneration = 0
+        )
+        viewModel.setPaginatorForTest(fakePaginator)
+    }
+
+    @After
+    fun tearDown() {
+        unmockkAll()
+    }
+
+    @Test
+    fun uiState_reflectsPaginatorInitialState() = runTest {
+        val initialState = viewModel.uiState.value
+        assertThat(initialState.isLoading).isTrue()
+        assertThat(initialState.totalPageCount).isEqualTo(0)
+        assertThat(initialState.generation).isEqualTo(0)
+    }
+
+    @Test
+    fun uiState_updatesWhenPaginatorIsLoadingChanges() = runTest {
+        assertThat(viewModel.uiState.value.isLoading).isTrue()
+
+        fakePaginator.isLoading = false
+        Snapshot.sendApplyNotifications()
+        advanceUntilIdle()
+
+        assertThat(viewModel.uiState.value.isLoading).isFalse()
+    }
+
+    @Test
+    fun uiState_updatesWhenPaginatorTotalPageCountChanges() = runTest {
+        assertThat(viewModel.uiState.value.totalPageCount).isEqualTo(0)
+
+        fakePaginator.totalPageCount = 123
+        Snapshot.sendApplyNotifications()
+        advanceUntilIdle()
+
+        assertThat(viewModel.uiState.value.totalPageCount).isEqualTo(123)
+    }
+
+    @Test
+    fun uiState_updatesWhenPaginatorGenerationChanges() = runTest {
+        assertThat(viewModel.uiState.value.generation).isEqualTo(0)
+
+        fakePaginator.generation = 5
+        Snapshot.sendApplyNotifications()
+        advanceUntilIdle()
+
+        assertThat(viewModel.uiState.value.generation).isEqualTo(5)
+    }
+
+    @Test
+    fun onLinkClick_callsPaginatorNavigateToHrefWithCorrectArguments() {
+        val currentChapter = "chapter1.xhtml"
+        val href = "#section2"
+
+        viewModel.onLinkClick(currentChapter, href) {}
+
+        assertThat(fakePaginator.lastNavigatedChapter).isEqualTo(currentChapter)
+        assertThat(fakePaginator.lastNavigatedHref).isEqualTo(href)
+    }
+    @Test
+    fun initialize_createsARealPaginatorAndUpdateState() = runTest {
+        // Arrange
+        val viewModel = PaginatedReaderViewModel() // Create a fresh ViewModel
+        val context = ApplicationProvider.getApplicationContext<Context>()
+        val textMeasurer = mockk<TextMeasurer>(relaxed = true)
+        val constraints = Constraints(maxWidth = 1080, maxHeight = 1920)
+        val textStyle = TextStyle.Default
+        val density = Density(1f)
+        val mathMLRenderer = mockk<MathMLRenderer>(relaxed = true)
+        val testBook = EpubBook(
+            fileName = "test.epub",
+            title = "Test Book",
+            author = "Test Author",
+            language = "en",
+            coverImage = null,
+            chapters = listOf(
+                EpubChapter(
+                    chapterId = "ch1",
+                    title = "Chapter 1",
+                    htmlFilePath = "ch1.html",
+                    absPath = "/ops/ch1.html",
+                    htmlContent = "<p>Some content</p>",
+                    plainTextContent = "Some content"
+                )
+            ),
+            css = mapOf("/ops/style.css" to "p {color: red;}"),
+            extractionBasePath = ""
+        )
+
+        // Mock dependencies for BookPaginator
+        val mockDao = mockk<BookCacheDao>(relaxed = true)
+        coEvery { mockDao.getProcessedBook(any()) } returns null // Simulate cache miss
+
+        val mockDb = mockk<BookCacheDatabase>()
+        every { mockDb.bookCacheDao() } returns mockDao
+
+        mockkObject(BookCacheDatabase.Companion)
+        every { BookCacheDatabase.getDatabase(any()) } returns mockDb
+
+        mockkObject(BookProcessingWorker.Companion)
+        every { BookProcessingWorker.enqueue(any(), any(), any(), any(), any(), any()) } returns Unit
+
+        // Pre-condition check
+        assertThat(viewModel.uiState.value.isLoading).isTrue()
+        assertThat(viewModel.paginator).isNull()
+
+        // Act
+        viewModel.initialize(
+            book = testBook,
+            textMeasurer = textMeasurer,
+            textConstraints = constraints,
+            textStyle = textStyle,
+            density = density,
+            isDarkTheme = false,
+            context = context,
+            initialChapterToPaginate = 0,
+            mathMLRenderer = mathMLRenderer
+        )
+        advanceUntilIdle() // Allow coroutines to complete
+
+        // Assert
+        assertThat(viewModel.paginator).isInstanceOf(BookPaginator::class.java)
+        assertThat(viewModel.uiState.value.isLoading).isFalse()
+        assertThat(viewModel.uiState.value.totalPageCount).isGreaterThan(0)
+    }
+
+    @Test
+    fun initialize_isIdempotent() = runTest {
+        // Arrange
+        val viewModel = PaginatedReaderViewModel()
+        val context = ApplicationProvider.getApplicationContext<Context>()
+        val textMeasurer = mockk<TextMeasurer>(relaxed = true)
+        val constraints = Constraints(maxWidth = 1080, maxHeight = 1920)
+        val textStyle = TextStyle.Default
+        val density = Density(1f)
+        val mathMLRenderer = mockk<MathMLRenderer>(relaxed = true)
+        val testBook = EpubBook(
+            fileName = "test.epub",
+            title = "Test Book",
+            author = "Test Author",
+            language = "en",
+            coverImage = null,
+            chapters = listOf(
+                EpubChapter(
+                    chapterId = "ch1",
+                    title = "Chapter 1",
+                    htmlFilePath = "ch1.html",
+                    absPath = "/ops/ch1.html",
+                    htmlContent = "<p>Some content</p>",
+                    plainTextContent = "Some content"
+                )
+            ),
+            css = mapOf("/ops/style.css" to "p {color: red;}"),
+            extractionBasePath = ""
+        )
+
+        // Mock dependencies
+        val mockDao = mockk<BookCacheDao>(relaxed = true)
+        coEvery { mockDao.getProcessedBook(any()) } returns null
+        val mockDb = mockk<BookCacheDatabase>()
+        every { mockDb.bookCacheDao() } returns mockDao
+        mockkObject(BookCacheDatabase.Companion)
+        every { BookCacheDatabase.getDatabase(any()) } returns mockDb
+        mockkObject(BookProcessingWorker.Companion)
+        every { BookProcessingWorker.enqueue(any(), any(), any(), any(), any(), any()) } returns Unit
+
+        // Act
+        viewModel.initialize(
+            book = testBook,
+            textMeasurer = textMeasurer,
+            textConstraints = constraints,
+            textStyle = textStyle,
+            density = density,
+            isDarkTheme = false,
+            context = context,
+            initialChapterToPaginate = 0,
+            mathMLRenderer = mathMLRenderer
+        )
+        advanceUntilIdle()
+
+        val firstPaginator = viewModel.paginator
+        assertThat(firstPaginator).isNotNull()
+
+        // Act again
+        viewModel.initialize(
+            book = testBook,
+            textMeasurer = textMeasurer,
+            textConstraints = constraints,
+            textStyle = textStyle,
+            density = density,
+            isDarkTheme = false,
+            context = context,
+            initialChapterToPaginate = 0,
+            mathMLRenderer = mathMLRenderer
+        )
+        advanceUntilIdle()
+
+        // Assert
+        val secondPaginator = viewModel.paginator
+        assertThat(secondPaginator).isSameInstanceAs(firstPaginator)
+    }
+}

app/src/androidTest/java/com/aryan/reader/paginatedreader/PaginatorTest.kt

@@ -0,0 +1,278 @@
+// PaginatorTest.kt
+package com.aryan.reader.paginatedreader
+
+import androidx.compose.ui.text.AnnotatedString
+import androidx.compose.ui.unit.Density
+import androidx.compose.ui.unit.dp
+import com.google.common.truth.Truth.assertThat
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import kotlinx.coroutines.test.runTest
+import org.junit.Test
+import org.junit.runner.RunWith
+
+class FakeSplittableMeasurementProvider(
+    private val heights: Map<ContentBlock, Int>,
+    private val splittableParagraphs: Map<ParagraphBlock, Pair<ParagraphBlock, ParagraphBlock>> = emptyMap(),
+    private val splittableWrappers: Map<WrappingContentBlock, Pair<WrappingContentBlock, List<ContentBlock>>> = emptyMap()
+) : BlockMeasurementProvider {
+    override suspend fun measure(block: ContentBlock): Int {
+        // Provide a more helpful error message if a block's height is not defined.
+        return heights[block] ?: error("No height specified for block: $block")
+    }
+
+    override suspend fun split(block: ParagraphBlock, availableHeight: Int): Pair<ParagraphBlock, ParagraphBlock>? {
+        val splitPair = splittableParagraphs[block]
+        if (splitPair != null) {
+            val part1Height = heights[splitPair.first] ?: 0
+            // Only return the split pair if the first part actually fits in the available height.
+            if (part1Height <= availableHeight) {
+                return splitPair
+            }
+        }
+        return null
+    }
+
+    override suspend fun split(block: WrappingContentBlock, availableHeight: Int): Pair<WrappingContentBlock, List<ContentBlock>>? {
+        val splitPair = splittableWrappers[block]
+        if (splitPair != null) {
+            val part1Height = heights[splitPair.first] ?: 0
+            if (part1Height <= availableHeight) {
+                return splitPair
+            }
+        }
+        return null
+    }
+}
+
+@RunWith(AndroidJUnit4::class)
+class PaginatorTest {
+
+    private val testDensity = Density(density = 1f, fontScale = 1f)
+    private val pageHeight = 1000
+
+    @Test
+    fun paginate_givenEmptyBlocks_createsZeroPages() = runTest {
+        val pages = paginate(emptyList(), pageHeight, FakeSplittableMeasurementProvider(emptyMap()), testDensity)
+        assertThat(pages).isEmpty()
+    }
+
+    @Test
+    fun paginate_givenBlocksThatFit_createsOnePage() = runTest {
+        val block1 = ParagraphBlock(content = AnnotatedString("Block 1"), blockIndex = 0)
+        val block2 = ParagraphBlock(content = AnnotatedString("Block 2"), blockIndex = 1)
+        val blocks = listOf(block1, block2)
+
+        val measurementProvider = FakeSplittableMeasurementProvider(
+            heights = mapOf(block1 to 200, block2 to 300)
+        )
+
+        val pages = paginate(blocks, pageHeight, measurementProvider, testDensity)
+
+        assertThat(pages).hasSize(1)
+        assertThat(pages.first().content).hasSize(2)
+    }
+
+    @Test
+    fun paginate_givenBlockThatOverflows_createsTwoPages() = runTest {
+        val block1 = ParagraphBlock(content = AnnotatedString("Block 1"), blockIndex = 0) // Height: 600
+        val block2 = ParagraphBlock(content = AnnotatedString("Block 2"), blockIndex = 1) // Height: 500
+        val blocks = listOf(block1, block2)
+
+        val measurementProvider = FakeSplittableMeasurementProvider(
+            heights = mapOf(block1 to 600, block2 to 500)
+        )
+
+        val pages = paginate(blocks, pageHeight, measurementProvider, testDensity)
+
+        assertThat(pages).hasSize(2)
+        assertThat(pages[0].content).containsExactly(block1)
+        assertThat(pages[1].content).containsExactly(block2)
+    }
+
+    @Test
+    fun paginate_correctlySplitsAParagraphBlock() = runTest {
+        val block1 = ParagraphBlock(content = AnnotatedString("First block"), blockIndex = 0)
+        val originalParagraph = ParagraphBlock(content = AnnotatedString("Long text to be split"), blockIndex = 1)
+        val part1 = ParagraphBlock(content = AnnotatedString("Long text"), blockIndex = 1)
+        val part2 = ParagraphBlock(content = AnnotatedString("to be split"), blockIndex = 1)
+        val blocks = listOf(block1, originalParagraph)
+
+        val measurementProvider = FakeSplittableMeasurementProvider(
+            heights = mapOf(
+                block1 to 500,
+                originalParagraph to 800,
+                part1 to 450, // Fits in the remaining 500
+                part2 to 350
+            ),
+            splittableParagraphs = mapOf(originalParagraph to (part1 to part2))
+        )
+
+        val pages = paginate(blocks, pageHeight, measurementProvider, testDensity)
+
+        assertThat(pages).hasSize(2)
+        assertThat(pages[0].content).containsExactly(block1, part1).inOrder()
+        assertThat(pages[1].content).containsExactly(part2)
+    }
+
+    @Test
+    fun paginate_correctlySplitsAWrappingContentBlock() = runTest {
+        val image = ImageBlock("image.png", null, 100f, 300f, blockIndex = 0)
+        val para1 = ParagraphBlock(content = AnnotatedString("Para 1"), blockIndex = 1)
+        val para2 = ParagraphBlock(content = AnnotatedString("Para 2"), blockIndex = 2)
+        val originalWrapper = WrappingContentBlock(floatedImage = image, paragraphsToWrap = listOf(para1, para2), blockIndex = 3)
+
+        val splitWrapper = WrappingContentBlock(floatedImage = image, paragraphsToWrap = listOf(para1), blockIndex = 3)
+        val remainingBlocks = listOf(para2)
+
+        val measurementProvider = FakeSplittableMeasurementProvider(
+            heights = mapOf(
+                originalWrapper to 1500,
+                splitWrapper to 300,
+                para2 to 200
+            ),
+            splittableWrappers = mapOf(originalWrapper to (splitWrapper to remainingBlocks))
+        )
+
+        val pages = paginate(listOf(originalWrapper), pageHeight, measurementProvider, testDensity)
+
+        assertThat(pages).hasSize(2)
+        assertThat(pages[0].content).containsExactly(splitWrapper)
+        assertThat(pages[1].content).containsExactly(para2)
+    }
+
+
+    @Test
+    fun paginate_respectsPageBreakInsideAvoid() = runTest {
+        val block1 = ParagraphBlock(content = AnnotatedString("First block"), blockIndex = 0) // Height 800
+        val unsplittableBlock = ParagraphBlock(
+            content = AnnotatedString("Can't split me"),
+            style = BlockStyle(pageBreakInsideAvoid = true),
+            blockIndex = 1
+        ) // Height 300
+        val blocks = listOf(block1, unsplittableBlock)
+
+        val measurementProvider = FakeSplittableMeasurementProvider(
+            heights = mapOf(block1 to 800, unsplittableBlock to 300)
+        )
+
+        val pages = paginate(blocks, pageHeight, measurementProvider, testDensity)
+
+        assertThat(pages).hasSize(2)
+        assertThat(pages[0].content).containsExactly(block1)
+        assertThat(pages[1].content).containsExactly(unsplittableBlock)
+    }
+
+    @Test
+    fun paginate_oversizedUnsplittableBlockGetsItsOwnPage() = runTest {
+        val oversizedBlock = ImageBlock(path = "test.jpg", altText = null, blockIndex = 0) // Height 1200
+        val blocks = listOf(oversizedBlock)
+
+        val measurementProvider = FakeSplittableMeasurementProvider(heights = mapOf(oversizedBlock to 1200))
+
+        val pages = paginate(blocks, pageHeight, measurementProvider, testDensity)
+
+        assertThat(pages).hasSize(1)
+        assertThat(pages[0].content).containsExactly(oversizedBlock)
+    }
+
+    @Test
+    fun paginate_collapsesVerticalMarginsBetweenBlocks() = runTest {
+        val block1 = ParagraphBlock(
+            content = AnnotatedString("Block 1"),
+            style = BlockStyle(margin = BoxBorders(bottom = 50.dp)), // 50px margin
+            blockIndex = 0
+        )
+        val block2 = ParagraphBlock(
+            content = AnnotatedString("Block 2"),
+            style = BlockStyle(margin = BoxBorders(top = 80.dp)), // 80px margin
+            blockIndex = 1
+        )
+        val blocks = listOf(block1, block2)
+        val measurementProvider = FakeSplittableMeasurementProvider(
+            heights = mapOf(block1 to 100, block2 to 100)
+        )
+
+        val pages = paginate(blocks, pageHeight, measurementProvider, testDensity)
+
+        assertThat(pages).hasSize(1)
+        val pageContent = pages.first().content
+        assertThat(pageContent).hasSize(2)
+        // The paginator logic sets the bottom margin of the previous block to 0
+        // and sets the top margin of the current block to the collapsed value.
+        assertThat(pageContent[0].style.margin.bottom).isEqualTo(0.dp)
+        assertThat(pageContent[1].style.margin.top).isEqualTo(80.dp) // max(50, 80) is 80
+    }
+
+    @Test
+    fun paginate_preservesTopMarginOfTheFirstBlockOnANewPage() = runTest {
+        val block1 = ParagraphBlock(
+            content = AnnotatedString("Block 1"),
+            style = BlockStyle(margin = BoxBorders(top = 30.dp)),
+            blockIndex = 0
+        )
+        val block2 = ParagraphBlock(content = AnnotatedString("Block 2"), blockIndex = 1)
+        val blocks = listOf(block1, block2)
+        val measurementProvider = FakeSplittableMeasurementProvider(
+            heights = mapOf(block1 to 980, block2 to 100)
+        )
+
+        val pages = paginate(blocks, pageHeight, measurementProvider, testDensity)
+        assertThat(pages).hasSize(2)
+
+        // First block on page 1 should have its top margin preserved.
+        val page1Block1 = pages[0].content.first()
+        assertThat(page1Block1.style.margin.top).isEqualTo(30.dp)
+
+        // First block on page 2 should also have its top margin preserved.
+        val page2Block1 = pages[1].content.first()
+        assertThat(page2Block1.style.margin.top).isEqualTo(0.dp) // The default is 0.dp
+    }
+
+    @Test
+    fun paginate_blockPushedToNextPageWhenNotEnoughSpaceForSplitting() = runTest {
+        val block1 = ParagraphBlock(content = AnnotatedString("Block 1"), blockIndex = 0)
+        val splittableBlock = ParagraphBlock(content = AnnotatedString("Splittable"), blockIndex = 1)
+        val part1 = ParagraphBlock(content = AnnotatedString("Split"), blockIndex = 1)
+        val part2 = ParagraphBlock(content = AnnotatedString("table"), blockIndex = 1)
+        val blocks = listOf(block1, splittableBlock)
+
+        val measurementProvider = FakeSplittableMeasurementProvider(
+            heights = mapOf(
+                block1 to 960, // Leaves 40px remaining, which is < 50, so no split should occur
+                splittableBlock to 100,
+                part1 to 30,
+                part2 to 70
+            ),
+            splittableParagraphs = mapOf(splittableBlock to (part1 to part2))
+        )
+
+        val pages = paginate(blocks, pageHeight, measurementProvider, testDensity)
+        assertThat(pages).hasSize(2)
+        assertThat(pages[0].content).containsExactly(block1)
+        assertThat(pages[1].content).containsExactly(splittableBlock) // Was not split
+    }
+
+    @Test
+    fun paginate_doesNotAddEmptyPart1AfterSplitting() = runTest {
+        val originalBlock = ParagraphBlock(content = AnnotatedString("Some text"), blockIndex = 0)
+        val part1 = ParagraphBlock(content = AnnotatedString(""), blockIndex = 0) // Empty part 1
+        val part2 = ParagraphBlock(content = AnnotatedString("Some text"), blockIndex = 0)
+        val blocks = listOf(originalBlock)
+
+        val measurementProvider = FakeSplittableMeasurementProvider(
+            heights = mapOf(
+                originalBlock to 200,
+                part1 to 0,
+                part2 to 200
+            ),
+            splittableParagraphs = mapOf(originalBlock to (part1 to part2))
+        )
+
+        // Set page height so that a split is attempted.
+        val pages = paginate(blocks, 150, measurementProvider, testDensity)
+        assertThat(pages).hasSize(1)
+        // The page should be empty because part1 was empty, and the original block was re-added
+        // to the remaining list. The next page then contains the full block.
+        assertThat(pages[0].content).containsExactly(part2)
+    }
+}

app/src/androidTest/java/com/aryan/reader/paginatedreader/StyleUtilsTest.kt

@@ -0,0 +1,115 @@
+// StyleUtilsTest.kt
+package com.aryan.reader.paginatedreader
+
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.isUnspecified
+import com.google.common.truth.Truth.assertThat
+import org.junit.Test
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import org.junit.runner.RunWith
+
+@RunWith(AndroidJUnit4::class)
+class StyleUtilsTest {
+
+    private val baseFontSizeSp = 16f
+    private val density = 2.0f
+    private val containerWidthPx = 1000
+
+    @Test
+    fun parseCssSizeToDp_handlesPxValues() {
+        assertThat(parseCssSizeToDp("100px", baseFontSizeSp, density, containerWidthPx)).isEqualTo(50.dp)
+    }
+
+    @Test
+    fun parseCssSizeToDp_handlesEmValues() {
+        assertThat(parseCssSizeToDp("1.5em", baseFontSizeSp, density, containerWidthPx)).isEqualTo(24.dp)
+    }
+
+    @Test
+    fun parseCssSizeToDp_handlesRemValues() {
+        assertThat(parseCssSizeToDp("2rem", baseFontSizeSp, density, containerWidthPx)).isEqualTo(32.dp)
+    }
+
+    @Test
+    fun parseCssSizeToDp_handlesPtValues() {
+        assertThat(parseCssSizeToDp("12pt", baseFontSizeSp, density, containerWidthPx).value).isWithin(0.01f).of(8.0f)
+    }
+
+    @Test
+    fun parseCssSizeToDp_handlesPercentageValues() {
+        // 50% of 1000px = 500px. 500px / 2.0 density = 250dp
+        assertThat(parseCssSizeToDp("50%", baseFontSizeSp, density, containerWidthPx)).isEqualTo(250.dp)
+    }
+
+    @Test
+    fun parseCssSizeToDp_returns0ForInvalidInput() {
+        assertThat(parseCssSizeToDp("invalid", baseFontSizeSp, density, containerWidthPx)).isEqualTo(0.dp)
+    }
+
+    @Test
+    fun parseCssSizeToDp_handlesZeroDensity() {
+        assertThat(parseCssSizeToDp("100px", baseFontSizeSp, 0f, containerWidthPx)).isEqualTo(0.dp)
+    }
+
+    @Test
+    fun parseCssSizeToDp_handlesZeroContainerWidthForPercentage() {
+        assertThat(parseCssSizeToDp("50%", baseFontSizeSp, density, 0)).isEqualTo(0.dp)
+    }
+
+    @Test
+    fun parseCssSizeToDp_handlesValuesWithWhitespace() {
+        assertThat(parseCssSizeToDp("  1.5em  ", baseFontSizeSp, density, containerWidthPx)).isEqualTo(24.dp)
+    }
+
+
+    @Test
+    fun parseCssDimensionToTextUnit_handlesPxValues() {
+        val result = parseCssDimensionToTextUnit("100px", containerWidthPx, density)
+        assertThat(result.isSp).isTrue()
+        assertThat(result.value).isWithin(0.01f).of(50f)
+    }
+
+    @Test
+    fun parseCssDimensionToTextUnit_handlesEmValues() {
+        val result = parseCssDimensionToTextUnit("1.5em", containerWidthPx, density)
+        assertThat(result.isEm).isTrue()
+        assertThat(result.value).isEqualTo(1.5f)
+    }
+
+    @Test
+    fun parseCssDimensionToTextUnit_handlesRemValues() {
+        // rem is treated as em
+        val result = parseCssDimensionToTextUnit("2rem", containerWidthPx, density)
+        assertThat(result.isEm).isTrue()
+        assertThat(result.value).isEqualTo(2f)
+    }
+
+    @Test
+    fun parseCssDimensionToTextUnit_handlesPtValues() {
+        val result = parseCssDimensionToTextUnit("12pt", containerWidthPx, density)
+        assertThat(result.isSp).isTrue()
+        assertThat(result.value).isWithin(0.01f).of(8.0f)
+    }
+
+    @Test
+    fun parseCssDimensionToTextUnit_handlesPercentageValues() {
+        val result = parseCssDimensionToTextUnit("50%", containerWidthPx, density)
+        assertThat(result.isSp).isTrue()
+        assertThat(result.value).isWithin(0.01f).of(250f)
+    }
+
+    @Test
+    fun parseCssDimensionToTextUnit_returnsUnspecifiedForInvalidInput() {
+        assertThat(parseCssDimensionToTextUnit("invalid", containerWidthPx, density).isUnspecified).isTrue()
+    }
+
+    @Test
+    fun parseCssDimensionToTextUnit_handlesZeroDensity() {
+        assertThat(parseCssDimensionToTextUnit("100px", containerWidthPx, 0f).isUnspecified).isTrue()
+    }
+
+    @Test
+    fun parseCssDimensionToTextUnit_handlesZeroContainerWidthForPercentage() {
+        assertThat(parseCssDimensionToTextUnit("50%", 0, density).isUnspecified).isTrue()
+    }
+}

app/src/androidTest/java/com/aryan/reader/pdf/MainDispatcherRule.kt

@@ -0,0 +1,35 @@
+// MainDispatcherRule.kt
+package com.aryan.reader.pdf
+
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.test.TestDispatcher
+import kotlinx.coroutines.test.UnconfinedTestDispatcher
+import kotlinx.coroutines.test.resetMain
+import kotlinx.coroutines.test.setMain
+import org.junit.rules.TestRule
+import org.junit.runner.Description
+import org.junit.runners.model.Statement
+
+/**
+ * A JUnit TestRule that sets the Main dispatcher to a TestDispatcher for the duration of a test.
+ * This allows tests to execute coroutines on the Main dispatcher without needing a real Android environment.
+ */
+@OptIn(ExperimentalCoroutinesApi::class)
+class MainDispatcherRule(
+    val testDispatcher: TestDispatcher = UnconfinedTestDispatcher()
+) : TestRule {
+    override fun apply(base: Statement, description: Description): Statement {
+        return object : Statement() {
+            @Throws(Throwable::class)
+            override fun evaluate() {
+                Dispatchers.setMain(testDispatcher)
+                try {
+                    base.evaluate()
+                } finally {
+                    Dispatchers.resetMain()
+                }
+            }
+        }
+    }
+}

app/src/androidTest/java/com/aryan/reader/pdf/PdfAnnotationTest.kt

@@ -0,0 +1,297 @@
+// PdfAnnotationTest.kt
+package com.aryan.reader.pdf
+
+import android.content.Context
+import android.content.Intent
+import android.net.Uri
+import androidx.compose.ui.test.assertIsDisplayed
+import androidx.compose.ui.test.assertIsEnabled
+import androidx.compose.ui.test.assertIsNotEnabled
+import androidx.compose.ui.test.assertIsSelected
+import androidx.compose.ui.test.assertIsNotSelected
+import androidx.compose.ui.test.click
+import androidx.compose.ui.test.junit4.createEmptyComposeRule
+import androidx.compose.ui.test.onNodeWithContentDescription
+import androidx.compose.ui.test.onNodeWithTag
+import androidx.compose.ui.test.performClick
+import androidx.compose.ui.test.performTouchInput
+import androidx.core.content.FileProvider
+import androidx.test.core.app.ActivityScenario
+import androidx.test.core.app.ApplicationProvider
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.aryan.reader.MainActivity
+import org.junit.After
+import org.junit.Before
+import org.junit.Rule
+import org.junit.Test
+import org.junit.runner.RunWith
+import java.io.File
+import java.util.UUID
+
+@RunWith(AndroidJUnit4::class)
+class PdfAnnotationTest {
+
+    @get:Rule
+    val composeTestRule = createEmptyComposeRule()
+
+    private val context: Context = ApplicationProvider.getApplicationContext()
+    private var currentPdfFile: File? = null
+    private var scenario: ActivityScenario<MainActivity>? = null
+    private val samplePdfUri: Uri by lazy { copyAssetToCache(context, "sample.pdf") }
+
+    private fun createPdfViewIntent(context: Context, uri: Uri): Intent {
+        return Intent(context, MainActivity::class.java).apply {
+            action = Intent.ACTION_VIEW
+            data = uri
+            addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
+        }
+    }
+
+    @Before
+    fun setup() {
+        // Clear settings to ensure fresh state for every test
+        context.getSharedPreferences("annotation_settings_global", Context.MODE_PRIVATE)
+            .edit().clear().commit()
+        context.getSharedPreferences("epub_reader_settings", Context.MODE_PRIVATE)
+            .edit().clear().commit()
+
+        scenario = ActivityScenario.launch(createPdfViewIntent(context, samplePdfUri))
+        waitForDocumentLoad()
+    }
+
+    @After
+    fun tearDown() {
+        scenario?.close()
+        currentPdfFile?.let { if (it.exists()) it.delete() }
+    }
+
+    private fun waitForDocumentLoad() {
+        composeTestRule.waitUntil(timeoutMillis = 15_000) {
+            runCatching {
+                composeTestRule.onNodeWithTag("PageNumberIndicator").assertIsDisplayed()
+                true
+            }.getOrDefault(false)
+        }
+    }
+
+    private fun enterEditMode() {
+        composeTestRule.onNodeWithContentDescription("Toggle Drawing Mode")
+            .assertIsDisplayed()
+            .performClick()
+        composeTestRule.waitForIdle()
+        composeTestRule.onNodeWithContentDescription("Close Edit Mode").assertIsDisplayed()
+    }
+
+    private fun tapOutsidePopup() {
+        // Taps the center of the PDF viewer to dismiss popups
+        composeTestRule.onNodeWithTag("PdfVerticalScroll").performTouchInput {
+            click(center)
+        }
+        composeTestRule.waitForIdle()
+    }
+
+    @Suppress("SameParameterValue")
+    private fun copyAssetToCache(context: Context, assetName: String): Uri {
+        val uniqueName = "${UUID.randomUUID()}_$assetName"
+        val file = File(context.cacheDir, uniqueName)
+        currentPdfFile = file
+        if (file.exists()) file.delete()
+        context.assets.open(assetName).use { inputStream ->
+            file.outputStream().use { outputStream ->
+                inputStream.copyTo(outputStream)
+            }
+        }
+        return FileProvider.getUriForFile(context, "${context.packageName}.provider", file)
+    }
+
+    // --- BASIC UI TESTS ---
+
+    @Test
+    fun testEnterAndExitEditMode() {
+        enterEditMode()
+
+        // Verify Dock Items exist using new Tags
+        composeTestRule.onNodeWithTag("DockItem_Pen").assertIsDisplayed()
+        composeTestRule.onNodeWithTag("DockItem_Highlighter").assertIsDisplayed()
+        composeTestRule.onNodeWithTag("DockItem_Eraser").assertIsDisplayed()
+
+        composeTestRule.onNodeWithContentDescription("Close Edit Mode").performClick()
+        composeTestRule.waitForIdle()
+        composeTestRule.onNodeWithContentDescription("Toggle Drawing Mode").assertIsDisplayed()
+    }
+
+    // --- TOOL LOGIC TESTS ---
+
+    @Test
+    fun testToolPersistence() {
+        enterEditMode()
+
+        // 1. Select Highlighter
+        composeTestRule.onNodeWithTag("DockItem_Highlighter").performClick()
+        composeTestRule.waitForIdle()
+
+        // 2. Verify selection state
+        composeTestRule.onNodeWithTag("DockItem_Highlighter").assertIsSelected()
+        composeTestRule.onNodeWithTag("DockItem_Pen").assertIsNotSelected()
+
+        // 3. Exit Edit Mode
+        composeTestRule.onNodeWithContentDescription("Close Edit Mode").performClick()
+        composeTestRule.waitForIdle()
+
+        // 4. Re-enter Edit Mode
+        enterEditMode()
+
+        // 5. Verify Highlighter is STILL selected (Persistence)
+        composeTestRule.onNodeWithTag("DockItem_Highlighter").assertIsSelected()
+    }
+
+    @Test
+    fun testEraserHasNoPopup() {
+        enterEditMode()
+
+        // Select Eraser
+        composeTestRule.onNodeWithTag("DockItem_Eraser").performClick()
+        composeTestRule.waitForIdle()
+        composeTestRule.onNodeWithTag("DockItem_Eraser").assertIsSelected()
+
+        // Click Eraser AGAIN (Should NOT open popup)
+        composeTestRule.onNodeWithTag("DockItem_Eraser").performClick()
+        composeTestRule.waitForIdle()
+
+        composeTestRule.onNodeWithTag("ToolSettingsPopup").assertDoesNotExist()
+    }
+
+    // --- SETTINGS POPUP TESTS ---
+
+    @Test
+    fun testSettingsPopupInteractions() {
+        enterEditMode()
+
+        // 1. Pen is default. Click Pen ONCE to open Settings.
+        // (Clicking twice would toggle it off, which caused previous failures)
+        composeTestRule.onNodeWithTag("DockItem_Pen").performClick()
+        composeTestRule.waitForIdle()
+
+        // 2. Verify Popup Displayed
+        composeTestRule.onNodeWithTag("ToolSettingsPopup").assertIsDisplayed()
+
+        // 3. Verify Pen Types exist
+        composeTestRule.onNodeWithTag("SettingsItem_FOUNTAIN_PEN").assertIsDisplayed()
+        composeTestRule.onNodeWithTag("SettingsItem_MARKER").assertIsDisplayed()
+
+        // 4. Switch internal Pen Type
+        composeTestRule.onNodeWithTag("SettingsItem_PENCIL").performClick()
+        composeTestRule.waitForIdle()
+        composeTestRule.onNodeWithTag("SettingsItem_PENCIL").assertIsSelected()
+
+        // 5. Dismiss Settings
+        tapOutsidePopup()
+        composeTestRule.onNodeWithTag("ToolSettingsPopup").assertDoesNotExist()
+    }
+
+    @Test
+    fun testColorPaletteAndThickness() {
+        enterEditMode()
+
+        // Open Settings for Pen (Default selected, so one click opens settings)
+        composeTestRule.onNodeWithTag("DockItem_Pen").performClick()
+        composeTestRule.waitForIdle()
+
+        // Test Palette Click (Index 1)
+        composeTestRule.onNodeWithTag("Palette_Item_1").assertIsDisplayed().performClick()
+
+        // Test Thickness Buttons
+        composeTestRule.onNodeWithTag("Property_Plus").performClick()
+        composeTestRule.onNodeWithTag("Property_Plus").performClick()
+        composeTestRule.onNodeWithTag("Property_Minus").performClick()
+
+        tapOutsidePopup()
+
+        // Quick verification that settings didn't crash app
+        composeTestRule.onNodeWithTag("DockItem_Pen").assertIsDisplayed()
+    }
+
+    // --- UNDO/REDO TESTS ---
+
+    @Test
+    fun testDrawingEnablesUndo() {
+        enterEditMode()
+
+        composeTestRule.onNodeWithContentDescription("Undo")
+            .assertIsDisplayed()
+            .assertIsNotEnabled()
+
+        // Draw a single DOT stroke to ensure exactly one action is recorded
+        composeTestRule.onNodeWithTag("PdfVerticalScroll").performTouchInput {
+            click(center)
+        }
+        composeTestRule.waitForIdle()
+
+        composeTestRule.onNodeWithContentDescription("Undo").assertIsEnabled()
+    }
+
+    @Test
+    fun testUndoRedoLogic() {
+        enterEditMode()
+
+        // Draw 1 stroke (click = dot) to ensure stack size is exactly 1
+        composeTestRule.onNodeWithTag("PdfVerticalScroll").performTouchInput {
+            click(center)
+        }
+        composeTestRule.waitForIdle()
+
+        val undoNode = composeTestRule.onNodeWithContentDescription("Undo")
+        val redoNode = composeTestRule.onNodeWithContentDescription("Redo")
+
+        undoNode.assertIsEnabled()
+        redoNode.assertIsNotEnabled()
+
+        // Perform Undo
+        undoNode.performClick()
+        composeTestRule.waitForIdle()
+
+        undoNode.assertIsNotEnabled()
+        redoNode.assertIsEnabled()
+
+        // Perform Redo
+        redoNode.performClick()
+        composeTestRule.waitForIdle()
+
+        undoNode.assertIsEnabled()
+        redoNode.assertIsNotEnabled()
+    }
+
+    // --- DOCK INTERACTIONS TESTS ---
+
+    @Test
+    fun testDockMinimization() {
+        enterEditMode()
+
+        // 1. Drag Dock to make it floating (using Pen icon as handle)
+        composeTestRule.onNodeWithTag("DockItem_Pen").performTouchInput {
+            down(center)
+            advanceEventTime(600) // Long press
+            // Drag UP significantly
+            moveBy(androidx.compose.ui.geometry.Offset(0f, -600f), delayMillis = 1000)
+            up()
+        }
+        composeTestRule.waitForIdle()
+
+        // 2. Minimize (Eye icon)
+        composeTestRule.onNodeWithContentDescription("Toggle Visibility").performClick()
+        composeTestRule.waitForIdle()
+
+        // 3. Verify Dock items are hidden
+        composeTestRule.onNodeWithTag("DockItem_Pen").assertDoesNotExist()
+
+        // 4. Verify "Show Dock" floating button is visible
+        composeTestRule.onNodeWithContentDescription("Show Dock").assertIsDisplayed()
+
+        // 5. Restore
+        composeTestRule.onNodeWithContentDescription("Show Dock").performClick()
+        composeTestRule.waitForIdle()
+
+        // 6. Verify Dock items return
+        composeTestRule.onNodeWithTag("DockItem_Pen").assertIsDisplayed()
+    }
+}

app/src/androidTest/java/com/aryan/reader/pdf/PdfCoverGeneratorTest.kt

@@ -0,0 +1,82 @@
+// app/src/androidTest/java/com/aryan/reader/pdf/PdfCoverGeneratorTest.kt
+package com.aryan.reader.pdf
+
+import android.content.Context
+import android.net.Uri
+import androidx.core.content.FileProvider
+import androidx.test.core.app.ApplicationProvider
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.google.common.truth.Truth.assertThat
+import kotlinx.coroutines.test.runTest
+import org.junit.After
+import org.junit.Before
+import org.junit.Rule
+import org.junit.Test
+import org.junit.runner.RunWith
+import java.io.File
+import java.io.IOException
+
+@RunWith(AndroidJUnit4::class)
+class PdfCoverGeneratorTest {
+
+    @get:Rule
+    val mainDispatcherRule = MainDispatcherRule()
+
+    private lateinit var context: Context
+    private lateinit var coverGenerator: PdfCoverGenerator
+    private var samplePdfUri: Uri? = null
+
+    @Before
+    fun setUp() {
+        context = ApplicationProvider.getApplicationContext()
+        coverGenerator = PdfCoverGenerator(context)
+        try {
+            samplePdfUri = copyAssetToCache(context, "sample.pdf")
+        } catch (_: IOException) {
+            println("Could not copy sample.pdf from assets. Skipping PdfCoverGenerator tests.")
+            samplePdfUri = null
+        }
+    }
+
+    @After
+    fun tearDown() {
+        val cacheFile = File(context.cacheDir, "sample.pdf")
+        if (cacheFile.exists()) {
+            cacheFile.delete()
+        }
+    }
+
+    @Test
+    fun generateCover_returnsBitmapForValidPdf() = runTest {
+        val uri = samplePdfUri ?: return@runTest
+
+        val targetHeight = 600
+        val cover = coverGenerator.generateCover(uri, targetHeight)
+
+        assertThat(cover).isNotNull()
+        assertThat(cover!!.height).isEqualTo(targetHeight)
+        assertThat(cover.width).isGreaterThan(0)
+    }
+
+    @Test
+    fun generateCover_returnsNullForInvalidUri() = runTest {
+        val invalidUri = Uri.fromFile(File("nonexistent/file.pdf"))
+        val cover = coverGenerator.generateCover(invalidUri)
+        assertThat(cover).isNull()
+    }
+
+    private fun copyAssetToCache(context: Context, @Suppress("SameParameterValue") assetName: String): Uri {
+        val file = File(context.cacheDir, assetName)
+        if (file.exists()) file.delete()
+        context.assets.open(assetName).use { inputStream ->
+            file.outputStream().use { outputStream ->
+                inputStream.copyTo(outputStream)
+            }
+        }
+        return FileProvider.getUriForFile(
+            context,
+            "${context.packageName}.provider",
+            file
+        )
+    }
+}

app/src/androidTest/java/com/aryan/reader/pdf/PdfHelperTest.kt

@@ -0,0 +1,85 @@
+// app/src/androidTest/java/com/aryan/reader/pdf/PdfHelperTest.kt
+package com.aryan.reader.pdf
+
+import android.graphics.Rect
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.google.common.truth.Truth.assertThat
+import org.junit.Test
+import org.junit.runner.RunWith
+
+@RunWith(AndroidJUnit4::class)
+class PdfHelperTest {
+
+    @Test
+    fun mergeRectsIntoLines_mergesHorizontallyAdjacentRects() {
+        val rects = listOf(
+            Rect(0, 0, 10, 10),
+            Rect(11, 0, 20, 10)
+        )
+        val merged = mergeRectsIntoLines(rects)
+        assertThat(merged).hasSize(1)
+        assertThat(merged.first()).isEqualTo(Rect(0, 0, 20, 10))
+    }
+
+    @Test
+    fun mergeRectsIntoLines_doesNotMergeVerticallySeparatedRects() {
+        val rects = listOf(
+            Rect(0, 0, 10, 10),
+            Rect(0, 11, 10, 20)
+        )
+        val merged = mergeRectsIntoLines(rects)
+        assertThat(merged).hasSize(2)
+    }
+
+    @Test
+    fun mergeRectsIntoLines_handlesMultipleLines() {
+        val rects = listOf(
+            Rect(0, 0, 10, 10),   // line 1
+            Rect(11, 0, 20, 10),  // line 1
+            Rect(0, 15, 10, 25),  // line 2
+            Rect(11, 15, 20, 25)  // line 2
+        )
+        val merged = mergeRectsIntoLines(rects)
+        assertThat(merged).hasSize(2)
+        assertThat(merged).containsExactly(
+            Rect(0, 0, 20, 10),
+            Rect(0, 15, 20, 25)
+        )
+    }
+
+    @Test
+    fun mergeRectsIntoLines_handlesEmptyList() {
+        val merged = mergeRectsIntoLines(emptyList())
+        assertThat(merged).isEmpty()
+    }
+
+    @Test
+    fun preprocessTextForTts_replacesNewlineWithSpaceForSoftBreak() {
+        val raw = "Hello\nWorld"
+        val processed = preprocessTextForTts(raw)
+        assertThat(processed.cleanText).isEqualTo("Hello World")
+    }
+
+    @Test
+    fun preprocessTextForTts_handlesNewlineAfterPunctuation() {
+        // Based on the current implementation, a newline after a sentence-ending punctuation
+        // results in the words being concatenated without a space. This test verifies that behavior.
+        val raw = "Hello.\nWorld"
+        val processed = preprocessTextForTts(raw)
+        assertThat(processed.cleanText).isEqualTo("Hello.World")
+    }
+
+    @Test
+    fun preprocessTextForTts_handlesCarriageReturn() {
+        val raw = "Hello\r\nWorld"
+        val processed = preprocessTextForTts(raw)
+        assertThat(processed.cleanText).isEqualTo("Hello World")
+    }
+
+    @Test
+    fun preprocessTextForTts_trimsResult() {
+        val raw = "  Hello World  \n"
+        val processed = preprocessTextForTts(raw)
+        assertThat(processed.cleanText).isEqualTo("Hello World")
+    }
+}

app/src/androidTest/java/com/aryan/reader/pdf/PdfViewerScreenTest.kt

@@ -0,0 +1,313 @@
+package com.aryan.reader.pdf
+
+import android.Manifest
+import android.content.Context
+import android.content.Intent
+import android.net.Uri
+import androidx.compose.ui.test.assert
+import androidx.compose.ui.test.assertIsDisplayed
+import androidx.compose.ui.test.assertTextContains
+import androidx.compose.ui.test.hasTestTag
+import androidx.compose.ui.test.hasText
+import androidx.compose.ui.test.junit4.createEmptyComposeRule
+import androidx.compose.ui.test.onAllNodesWithText
+import androidx.compose.ui.test.onNodeWithContentDescription
+import androidx.compose.ui.test.onNodeWithTag
+import androidx.compose.ui.test.onNodeWithText
+import androidx.compose.ui.test.onRoot
+import androidx.compose.ui.test.performClick
+import androidx.compose.ui.test.performTextInput
+import androidx.compose.ui.test.performTouchInput
+import androidx.compose.ui.test.swipe
+import androidx.core.content.FileProvider
+import androidx.test.core.app.ApplicationProvider
+import androidx.test.ext.junit.rules.ActivityScenarioRule
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import androidx.test.rule.GrantPermissionRule
+import com.aryan.reader.MainActivity
+import org.junit.After
+import org.junit.Rule
+import org.junit.Test
+import org.junit.runner.RunWith
+import java.io.File
+import java.util.UUID
+
+@RunWith(AndroidJUnit4::class)
+class PdfViewerScreenTest {
+
+    @get:Rule
+    val composeTestRule = createEmptyComposeRule()
+
+    @get:Rule
+    val grantPermissionRule: GrantPermissionRule = GrantPermissionRule.grant(Manifest.permission.POST_NOTIFICATIONS)
+
+    @org.junit.Before
+    fun setup() {
+        val context = ApplicationProvider.getApplicationContext<Context>()
+        context.getSharedPreferences("epub_reader_settings", Context.MODE_PRIVATE)
+            .edit()
+            .clear()
+            .commit()
+    }
+
+    private fun createPdfViewIntent(context: Context, uri: Uri): Intent {
+        return Intent(context, MainActivity::class.java).apply {
+            action = Intent.ACTION_VIEW
+            data = uri
+            addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
+        }
+    }
+
+    private val context: Context = ApplicationProvider.getApplicationContext()
+
+    private var currentPdfFile: File? = null
+
+    private val samplePdfUri: Uri by lazy { copyAssetToCache(context, "sample.pdf") }
+
+    @get:Rule
+    val activityRule = ActivityScenarioRule<MainActivity>(createPdfViewIntent(context, samplePdfUri))
+
+    @After
+    fun tearDown() {
+        currentPdfFile?.let {
+            if (it.exists()) it.delete()
+        }
+    }
+
+    private fun waitForDocumentLoad(pageText: String = "Page 1 of 4") {
+        composeTestRule.waitUntil(timeoutMillis = 15_000) {
+            composeTestRule
+                .onAllNodesWithText(pageText)
+                .fetchSemanticsNodes().size == 1
+        }
+    }
+
+    private fun ensurePaginationMode() {
+        composeTestRule.onNodeWithContentDescription("More Options").performClick()
+        composeTestRule.onNodeWithText("Reading Mode: Paginated").performClick()
+        composeTestRule.waitForIdle()
+    }
+
+    @Test
+    fun documentLoadsAndDisplaysCorrectPageCount() {
+        waitForDocumentLoad()
+        composeTestRule.onNodeWithTag("PageNumberIndicator")
+            .assertIsDisplayed()
+    }
+
+    @Test
+    fun tableOfContents_displaysEmptyState() {
+        waitForDocumentLoad()
+
+        composeTestRule.onNodeWithTag("TocButton").performClick()
+
+        composeTestRule.onNodeWithText("Chapters are not available for this book.").assertIsDisplayed()
+    }
+
+    @Suppress("SameParameterValue")
+    private fun copyAssetToCache(context: Context, assetName: String): Uri {
+        val uniqueName = "${UUID.randomUUID()}_$assetName"
+        val file = File(context.cacheDir, uniqueName)
+
+        currentPdfFile = file
+
+        if (file.exists()) file.delete()
+        context.assets.open(assetName).use { inputStream ->
+            file.outputStream().use { outputStream ->
+                inputStream.copyTo(outputStream)
+            }
+        }
+        return FileProvider.getUriForFile(
+            context,
+            "${context.packageName}.provider",
+            file
+        )
+    }
+
+    @Test
+    fun bookmarkFunctionality_addNavigateAndDelete() {
+        waitForDocumentLoad()
+
+        ensurePaginationMode()
+
+        composeTestRule.onNodeWithText("Page 1 of 4").assertIsDisplayed()
+
+        try {
+            composeTestRule.onRoot().performTouchInput { swipe(start = this.centerRight, end = this.centerLeft, durationMillis = 300) }
+            composeTestRule.onRoot().performClick()
+            composeTestRule.waitUntil(5_000) {
+                composeTestRule.onAllNodesWithText("Page 2 of 4").fetchSemanticsNodes().isNotEmpty()
+            }
+            composeTestRule.onNodeWithText("Page 2 of 4").assertIsDisplayed()
+        } catch (e: Exception) {
+            throw e
+        }
+
+        try {
+            composeTestRule.onNodeWithContentDescription("More Options").performClick()
+            composeTestRule.onNodeWithText("Bookmark this page").performClick()
+            composeTestRule.waitForIdle()
+        } catch (e: Exception) {
+            throw e
+        }
+
+        try {
+            composeTestRule.onRoot().performTouchInput { swipe(start = this.centerRight, end = this.centerLeft, durationMillis = 300) }
+            composeTestRule.onRoot().performClick()
+            composeTestRule.waitUntil(5_000) {
+                composeTestRule.onAllNodesWithText("Page 3 of 4").fetchSemanticsNodes().isNotEmpty()
+            }
+            composeTestRule.onNodeWithText("Page 3 of 4").assertIsDisplayed()
+        } catch (e: Exception) {
+            throw e
+        }
+
+        try {
+            composeTestRule.onNodeWithTag("TocButton").performClick()
+            composeTestRule.onNodeWithTag("BookmarksTab").performClick()
+            composeTestRule.waitForIdle()
+            composeTestRule.onNodeWithTag("BookmarkItem_1").assertIsDisplayed()
+                .assert(hasText("Page 2", substring = true))
+        } catch (e: Exception) {
+            throw e
+        }
+
+        try {
+            composeTestRule.onNodeWithTag("BookmarkItem_1").performClick()
+            composeTestRule.waitForIdle()
+            composeTestRule.waitUntil(5_000) {
+                composeTestRule.onAllNodes(hasTestTag("PageNumberIndicator").and(hasText("Page 2 of 4"))).fetchSemanticsNodes().size == 1
+            }
+            composeTestRule.onNode(hasTestTag("PageNumberIndicator").and(hasText("Page 2 of 4"))).assertIsDisplayed()
+
+        } catch (e: Exception) {
+            throw e
+        }
+
+        try {
+            composeTestRule.onNodeWithTag("TocButton").performClick()
+            composeTestRule.onNodeWithTag("BookmarksTab").performClick()
+            composeTestRule.waitForIdle()
+        } catch (e: Exception) {
+            throw e
+        }
+
+        try {
+            composeTestRule.onNodeWithContentDescription("More options for bookmark").performClick()
+            composeTestRule.onNodeWithText("Delete").performClick()
+        } catch (e: Exception) {
+            throw e
+        }
+
+        try {
+            composeTestRule.onNodeWithText("Delete", useUnmergedTree = true).performClick()
+        } catch (e: Exception) {
+            throw e
+        }
+
+        try {
+            composeTestRule.onNodeWithTag("BookmarkItem_1").assertDoesNotExist()
+            composeTestRule.onNodeWithText("You haven't added any bookmarks yet.").assertIsDisplayed()
+        } catch (e: Exception) {
+            throw e
+        }
+    }
+
+    @Test
+    fun sliderNavigation_opensAndDisplaysCorrectly() {
+        waitForDocumentLoad()
+
+        composeTestRule.onNodeWithContentDescription("Navigate with slider").performClick()
+        composeTestRule.onNodeWithContentDescription("Exit slider navigation").assertIsDisplayed()
+        composeTestRule.onNodeWithText("1 / 4").assertIsDisplayed()
+    }
+
+    @Test
+    fun displayMode_switchesToVerticalScroll() {
+        waitForDocumentLoad()
+
+        // Ensure we are in Pagination mode first to test the switch
+        ensurePaginationMode()
+
+        // Verify Vertical Scroll component is NOT displayed initially
+        composeTestRule.onNodeWithTag("PdfVerticalScroll").assertDoesNotExist()
+
+        // Switch to Vertical Scroll
+        composeTestRule.onNodeWithContentDescription("More Options").performClick()
+        composeTestRule.onNodeWithText("Reading Mode: Vertical scroll").performClick()
+
+        composeTestRule.waitForIdle()
+
+        // Verify Vertical Scroll component IS displayed
+        composeTestRule.onNodeWithTag("PdfVerticalScroll").assertIsDisplayed()
+
+        // Switch back to Pagination
+        ensurePaginationMode()
+
+        // Verify Vertical Scroll component is gone
+        composeTestRule.onNodeWithTag("PdfVerticalScroll").assertDoesNotExist()
+    }
+
+    @Test
+    fun search_uiOpensAndAcceptsQuery() {
+        waitForDocumentLoad()
+
+        // Click search button
+        composeTestRule.onNodeWithTag("SearchButton").performClick()
+
+        composeTestRule.onNodeWithText("English, Spanish, French, etc.").performClick()
+
+        // Verify text field appears
+        composeTestRule.onNodeWithTag("SearchTextField").assertIsDisplayed()
+
+        // Enter text
+        composeTestRule.onNodeWithTag("SearchTextField").performTextInput("test query")
+
+        // Verify text exists in the field
+        composeTestRule.onNodeWithTag("SearchTextField").assertTextContains("test query")
+
+        // Close search
+        composeTestRule.onNodeWithContentDescription("Close Search").performClick()
+
+        // Verify text field is gone
+        composeTestRule.onNodeWithTag("SearchTextField").assertDoesNotExist()
+    }
+
+    @Test
+    fun fullScreen_togglesVisibility() {
+        waitForDocumentLoad()
+
+        // Click enter full screen button
+        composeTestRule.onNodeWithContentDescription("Enter Full Screen").performClick()
+
+        // Verify exit full screen button appears
+        composeTestRule.onNodeWithContentDescription("Exit Full Screen").assertIsDisplayed()
+
+        // Click exit full screen
+        composeTestRule.onNodeWithContentDescription("Exit Full Screen").performClick()
+
+        // Verify exit button is gone and enter button returns
+        composeTestRule.onNodeWithContentDescription("Exit Full Screen").assertDoesNotExist()
+        composeTestRule.onNodeWithContentDescription("Enter Full Screen").assertIsDisplayed()
+    }
+
+    @Test
+    fun darkMode_togglesState() {
+        waitForDocumentLoad()
+
+        // Initial state: Light mode (default from cleared prefs), so button says "Enable Dark Mode"
+        composeTestRule.onNodeWithContentDescription("Enable Dark Mode").assertIsDisplayed()
+
+        // Toggle On
+        composeTestRule.onNodeWithContentDescription("Enable Dark Mode").performClick()
+
+        // State changed: Now button says "Disable Dark Mode"
+        composeTestRule.onNodeWithContentDescription("Disable Dark Mode").assertIsDisplayed()
+
+        // Toggle Off
+        composeTestRule.onNodeWithContentDescription("Disable Dark Mode").performClick()
+
+        // State changed back
+        composeTestRule.onNodeWithContentDescription("Enable Dark Mode").assertIsDisplayed()
+    }
+}

app/src/androidTest/java/com/aryan/reader/tts/BaseTtsSynthesizerTest.kt

@@ -0,0 +1,105 @@
+// BaseTtsSynthesizerTest.kt
+package com.aryan.reader.tts
+
+import android.speech.tts.TextToSpeech
+import androidx.test.core.app.ApplicationProvider
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.google.common.truth.Truth.assertThat
+import kotlinx.coroutines.runBlocking
+import kotlinx.coroutines.withTimeout
+import org.junit.After
+import org.junit.Before
+import org.junit.Rule
+import org.junit.Test
+import org.junit.runner.RunWith
+
+@RunWith(AndroidJUnit4::class)
+class BaseTtsSynthesizerTest {
+
+    @get:Rule
+    val mainDispatcherRule = MainDispatcherRule()
+
+    private lateinit var synthesizer: BaseTtsSynthesizer
+    private var ttsEngineAvailable = false
+
+    @Before
+    fun setUp() {
+        // Ensure TTS is available on the device/emulator before running tests
+        val tts = TextToSpeech(ApplicationProvider.getApplicationContext(), null)
+        if (tts.engines.isNotEmpty()) {
+            ttsEngineAvailable = true
+            synthesizer = BaseTtsSynthesizer(ApplicationProvider.getApplicationContext())
+        }
+        tts.shutdown()
+    }
+
+    @After
+    fun tearDown() {
+        if (this::synthesizer.isInitialized) {
+            synthesizer.shutdown()
+        }
+    }
+
+    @Test
+    fun initialize_initializesTtsEngineSuccessfully() {
+        if (!ttsEngineAvailable) return
+
+        runBlocking {
+            // This will throw if it fails
+            withTimeout(10000L) {
+                synthesizer.initialize()
+            }
+            // No assertion needed, success is not throwing an exception.
+        }
+    }
+
+    @Test
+    fun synthesizeToFile_withValidText_createsAudioFile() {
+        if (!ttsEngineAvailable) return
+
+        runBlocking {
+            withTimeout(15000L) {
+                synthesizer.initialize()
+                val (file, returnedText) = synthesizer.synthesizeToFile("This is a test.")
+
+                assertThat(file).isNotNull()
+                assertThat(file?.exists()).isTrue()
+                assertThat(file?.length()).isGreaterThan(0L)
+                assertThat(returnedText).isEqualTo("This is a test.")
+
+                file?.delete()
+            }
+        }
+    }
+
+    @Test
+    fun synthesizeToFile_withBlankText_returnsNullFile() {
+        if (!ttsEngineAvailable) return
+
+        runBlocking {
+            synthesizer.initialize()
+            val (file, returnedText) = synthesizer.synthesizeToFile("  ")
+
+            assertThat(file).isNull()
+            assertThat(returnedText).isEqualTo("  ")
+        }
+    }
+
+    @Test
+    fun synthesizeToFile_withoutInitializingFirst_initializesAndSucceeds() {
+        if (!ttsEngineAvailable) return
+
+        runBlocking {
+            withTimeout(15000L) {
+                val (file, returnedText) = synthesizer.synthesizeToFile("This should work.")
+
+                assertThat(file).isNotNull()
+                assertThat(file?.exists()).isTrue()
+                assertThat(file?.length()).isGreaterThan(0L)
+                assertThat(returnedText).isEqualTo("This should work.")
+
+                file?.delete()
+            }
+        }
+    }
+}

app/src/androidTest/java/com/aryan/reader/tts/MainDispatcherRule.kt

@@ -0,0 +1,27 @@
+package com.aryan.reader.tts
+
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.test.TestDispatcher
+import kotlinx.coroutines.test.UnconfinedTestDispatcher
+import kotlinx.coroutines.test.resetMain
+import kotlinx.coroutines.test.setMain
+import org.junit.rules.TestWatcher
+import org.junit.runner.Description
+
+/**
+ * A JUnit TestRule that sets the Main dispatcher to a TestDispatcher for the duration of a test.
+ * This allows tests to execute coroutines on the Main dispatcher without needing a real Android environment.
+ */
+@OptIn(ExperimentalCoroutinesApi::class)
+class MainDispatcherRule(
+    private val testDispatcher: TestDispatcher = UnconfinedTestDispatcher()
+) : TestWatcher() {
+    override fun starting(description: Description) {
+        Dispatchers.setMain(testDispatcher)
+    }
+
+    override fun finished(description: Description) {
+        Dispatchers.resetMain()
+    }
+}

app/src/androidTest/java/com/aryan/reader/tts/TtsUtilsTest.kt

@@ -0,0 +1,71 @@
+// TtsUtilsTest.kt
+package com.aryan.reader.tts
+
+import com.google.common.truth.Truth.assertThat
+import org.junit.Test
+import org.junit.runner.RunWith
+import androidx.test.ext.junit.runners.AndroidJUnit4
+
+@RunWith(AndroidJUnit4::class)
+class TtsUtilsTest {
+
+    @Test
+    fun splitTextIntoChunks_withShortText_returnsSingleChunk() {
+        val text = "This is a short sentence."
+        val chunks = splitTextIntoChunks(text, 100)
+        assertThat(chunks).containsExactly("This is a short sentence.")
+    }
+
+    @Test
+    fun splitTextIntoChunks_withMultipleSentences_splitsCorrectly() {
+        val text = "First sentence. Second sentence! Third sentence? And a fourth."
+        val chunks = splitTextIntoChunks(text, 20)
+        assertThat(chunks).containsExactly(
+            "First sentence.",
+            "Second sentence!",
+            "Third sentence?",
+            "And a fourth."
+        ).inOrder()
+    }
+
+    @Test
+    fun splitTextIntoChunks_combinesShortSentences() {
+        val text = "First. Second. Third. Fourth."
+        val chunks = splitTextIntoChunks(text, maxLengthPerChunk = 20)
+        assertThat(chunks).containsExactly(
+            "First. Second.",
+            "Third. Fourth."
+        ).inOrder()
+    }
+
+    @Test
+    fun splitTextIntoChunks_withLongSentence_doesNotSplitSentence() {
+        val text = "This is a very long sentence that exceeds the maximum chunk length but has no punctuation to split on."
+        val chunks = splitTextIntoChunks(text, 50)
+        assertThat(chunks).containsExactly(text)
+    }
+
+    @Test
+    fun splitTextIntoChunks_withEmptyText_returnsEmptyList() {
+        val text = ""
+        val chunks = splitTextIntoChunks(text, 100)
+        assertThat(chunks).isEmpty()
+    }
+
+    @Test
+    fun splitTextIntoChunks_withBlankText_returnsEmptyList() {
+        val text = "   "
+        val chunks = splitTextIntoChunks(text, 100)
+        assertThat(chunks).isEmpty()
+    }
+
+    @Test
+    fun splitTextIntoChunks_handlesAbbreviations() {
+        val text = "Mr. Smith went to Washington. Dr. Jones followed."
+        val chunks = splitTextIntoChunks(text, 40)
+        assertThat(chunks).containsExactly(
+            "Mr. Smith went to Washington.",
+            "Dr. Jones followed."
+        ).inOrder()
+    }
+}

app/src/debug/java/com/aryan/reader/epubreader/EpubTestActivity.kt

@@ -0,0 +1,40 @@
+package com.aryan.reader.epubreader
+
+import android.os.Build
+import android.os.Bundle
+import androidx.activity.ComponentActivity
+import androidx.activity.compose.setContent
+import androidx.annotation.RequiresApi
+import com.aryan.reader.RenderMode
+import com.aryan.reader.epub.EpubBook
+import kotlinx.serialization.json.Json
+
+class EpubTestActivity : ComponentActivity() {
+    @RequiresApi(Build.VERSION_CODES.VANILLA_ICE_CREAM)
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        val bookJson = intent.getStringExtra("epubBookJson")
+        val book = Json.decodeFromString<EpubBook>(bookJson!!)
+
+        setContent {
+            EpubReaderScreen(
+                epubBook = book,
+                renderMode = RenderMode.VERTICAL_SCROLL,
+                initialLocator = null,
+                initialCfi = null,
+                initialBookmarksJson = null,
+                isProUser = false,
+                pendingSyncUpdate = null,
+                onClearPendingSyncUpdate = {},
+                onNavigateBack = {},
+                onSavePosition = { _, _, _ -> },
+                onBookmarksChanged = {},
+                onNavigateToPro = {},
+                coverImagePath = null,
+                onRenderModeChange = {},
+                customFonts = TODO(),
+                onImportFont = TODO()
+            )
+        }
+    }
+}

app/src/debug/java/com/aryan/reader/epubreader/HiltTestActivity.kt

@@ -0,0 +1,12 @@
+package com.aryan.reader.epubreader
+
+import androidx.activity.ComponentActivity
+
+/**
+ * A simple, empty activity used as a host for Compose UI tests.
+ * It allows tests to launch a Compose view without needing the app's full
+ * navigation or main activity setup. It should be placed in the `debug`
+ * source set (`app/src/debug/java/...`) to ensure it is not included
+ * in the release build of your app.
+ */
+class HiltTestActivity : ComponentActivity()

app/src/main/AndroidManifest.xml

@@ -0,0 +1,126 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" android:maxSdkVersion="32" />
+    <uses-permission android:name="android.permission.POST_NOTIFICATIONS"/>
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_MEDIA_PLAYBACK" />
+
+    <queries>
+        <intent>
+            <action android:name="android.intent.action.TTS_SERVICE" />
+        </intent>
+    </queries>
+
+    <application
+        android:name=".MyApplication"
+        android:allowBackup="true"
+        android:dataExtractionRules="@xml/data_extraction_rules"
+        android:fullBackupContent="@xml/backup_rules"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.Reader"
+        android:networkSecurityConfig="@xml/network_security_config">
+
+        <activity
+            android:name=".MainActivity"
+            android:exported="true"
+            android:theme="@style/Theme.Reader"
+            android:launchMode="singleTask">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+
+            <!-- PDF Filter -->
+            <intent-filter>
+                <action android:name="android.intent.action.VIEW" />
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.BROWSABLE" />
+                <data android:scheme="content" />
+                <data android:scheme="file" />
+                <data android:mimeType="application/pdf" />
+            </intent-filter>
+
+            <!-- EPUB Filter -->
+            <intent-filter>
+                <action android:name="android.intent.action.VIEW" />
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.BROWSABLE" />
+                <data android:scheme="content" />
+                <data android:scheme="file" />
+                <data android:mimeType="application/epub+zip" />
+            </intent-filter>
+
+            <!-- MOBI / Kindle Filter -->
+            <intent-filter>
+                <action android:name="android.intent.action.VIEW" />
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.BROWSABLE" />
+                <data android:scheme="content" />
+                <data android:scheme="file" />
+                <data android:mimeType="application/x-mobipocket-ebook" />
+                <data android:mimeType="application/vnd.amazon.mobi8-ebook" />
+                <data android:mimeType="application/vnd.amazon.ebook" />
+                <data android:mimeType="application/octet-stream" />
+                <data android:host="*" />
+                <data android:pathPattern=".*\\.mobi" />
+                <data android:pathPattern=".*\\.azw3" />
+            </intent-filter>
+
+            <!-- Markdown and Plain Text Filter -->
+            <intent-filter>
+                <action android:name="android.intent.action.VIEW" />
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.BROWSABLE" />
+                <data android:scheme="content" />
+                <data android:scheme="file" />
+                <data android:mimeType="text/plain" />
+                <data android:mimeType="text/markdown" />
+                <data android:mimeType="text/x-markdown" />
+                <data android:mimeType="text/*" />
+            </intent-filter>
+
+            <intent-filter>
+                <action android:name="android.intent.action.VIEW" />
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.BROWSABLE" />
+                <data android:scheme="content" />
+                <data android:scheme="file" />
+                <data android:host="*" />
+                <data android:mimeType="*/*" />
+                <data android:pathPattern=".*\\.md" />
+                <data android:pathPattern=".*\\.markdown" />
+            </intent-filter>
+
+            <intent-filter>
+                <action android:name="android.intent.action.VIEW" />
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.BROWSABLE" />
+                <data android:scheme="content" />
+                <data android:mimeType="application/octet-stream" />
+            </intent-filter>
+        </activity>
+
+        <service
+            android:name=".tts.TtsService"
+            android:exported="true"
+            android:foregroundServiceType="mediaPlayback">
+            <intent-filter>
+                <action android:name="androidx.media3.session.MediaSessionService"/>
+            </intent-filter>
+        </service>
+
+        <provider
+            android:name="androidx.core.content.FileProvider"
+            android:authorities="${applicationId}.provider"
+            android:exported="false"
+            android:grantUriPermissions="true">
+            <meta-data
+                android:name="android.support.FILE_PROVIDER_PATHS"
+                android:resource="@xml/provider_paths" />
+        </provider>
+    </application>
+
+</manifest>

app/src/main/assets/MathML-template.html

@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <script>
+        console.log("MATH_DIAGNOSTIC: MathML-template.html script block started.");
+        window.MathJax = {
+            svg: {
+                fontCache: 'none', // Disable font cache for better performance in this context
+                displayAlign: 'left',
+                displayIndent: '0',
+                scale: 1.0,
+            },
+            startup: {
+                ready: () => {
+                    console.log("MATH_DIAGNOSTIC: MathJax startup.ready callback fired.");
+                    MathJax.startup.defaultReady();
+                    if (window.AndroidBridge) {
+                        console.log("MATH_DIAGNOSTIC: Calling AndroidBridge.onMathJaxReady()");
+                        window.AndroidBridge.onMathJaxReady();
+                    } else {
+                        console.error("MATH_DIAGNOSTIC: AndroidBridge not found!");
+                    }
+                }
+            }
+        };
+    </script>
+    <script type="text/javascript" id="MathJax-script" async
+            src="file:///android_asset/mathjax/tex-mml-svg.js">
+    </script>
+</head>
+<body>
+<div id="math-container"></div>
+</body>
+</html>

app/src/main/assets/demo_art.svg

@@ -0,0 +1,70 @@
+<svg viewBox="0 0 800 300" xmlns="http://www.w3.org/2000/svg">
+  <defs>
+    <linearGradient id="underlineGradient" x1="0%" y1="0%" x2="100%" y2="0%">
+      <stop offset="0%" style="stop-color:#F59E0B;stop-opacity:1" />
+      <stop offset="50%" style="stop-color:#EC4899;stop-opacity:1" />
+      <stop offset="100%" style="stop-color:#8B5CF6;stop-opacity:1" />
+    </linearGradient>
+  </defs>
+
+  <!-- Background -->
+  <rect width="800" height="300" fill="#f0fdf4"/>
+
+  <!-- Decorative dots -->
+  <circle cx="120" cy="90" r="5" fill="#F59E0B" opacity="0.7" />
+  <circle cx="680" cy="210" r="6" fill="#EC4899" opacity="0.7" />
+  <circle cx="700" cy="110" r="4" fill="#8B5CF6" opacity="0.7" />
+  <circle cx="150" cy="230" r="5" fill="#10B981" opacity="0.6" />
+  <circle cx="650" cy="80" r="4" fill="#F59E0B" opacity="0.6" />
+  <circle cx="90" cy="180" r="3" fill="#EC4899" opacity="0.5" />
+  <circle cx="720" cy="170" r="5" fill="#8B5CF6" opacity="0.6" />
+
+  <!-- Single-stroke handwritten "Try Episteme!" -->
+  <g stroke="#10B981" stroke-width="3.5" fill="none" stroke-linecap="round" stroke-linejoin="round">
+    <!-- T -->
+    <path d="M 80 115 L 140 115 M 110 115 L 110 175 Q 110 185 115 185" />
+    
+    <!-- r -->
+    <path d="M 150 145 L 150 180 M 150 155 Q 155 145 165 145 Q 172 145 175 150" />
+    
+    <!-- y -->
+    <path d="M 185 145 L 190 180 L 200 145 L 198 185 Q 197 200 188 210 Q 182 215 176 210" />
+    
+    <!-- Space, then E -->
+    <path d="M 240 110 L 240 180 M 240 110 L 285 110 M 240 145 L 275 145 M 240 180 L 285 180" />
+    
+    <!-- p -->
+    <path d="M 305 145 L 305 215 M 305 158 Q 305 145 320 145 Q 340 145 345 160 Q 348 170 345 180 Q 340 195 320 195 Q 305 195 305 182" />
+    
+    <!-- i -->
+    <path d="M 365 145 L 365 180 M 365 130 L 365 132" />
+    
+    <!-- s -->
+    <path d="M 428 148 Q 418 143 408 145 Q 398 147 395 155 Q 393 162 400 165 Q 410 170 420 168 Q 428 166 430 172 Q 432 180 422 183 Q 412 186 402 182" />
+    
+    <!-- t -->
+    <path d="M 445 125 L 445 175 Q 445 185 455 185 Q 465 185 470 180 M 435 145 L 460 145" />
+    
+    <!-- e -->
+    <path d="M 530 158 L 490 160 Q 488 165 490 172 Q 493 182 505 185 Q 520 187 528 178 Q 533 170 528 160 Q 520 148 505 148 Q 495 148 490 153" />
+    
+    <!-- m -->
+    <path d="M 545 145 L 545 180 M 545 155 Q 545 145 555 145 Q 565 145 565 155 L 565 180 M 565 155 Q 565 145 575 145 Q 585 145 585 155 L 585 180" />
+    
+    <!-- e (second) -->
+    <path d="M 635 158 L 600 160 Q 598 165 600 172 Q 603 182 615 185 Q 628 187 635 178 Q 640 170 635 160 Q 628 148 613 148 Q 603 148 598 153" />
+    
+    <!-- ! -->
+    <path d="M 660 125 L 660 165 M 660 178 L 660 182" />
+  </g>
+
+  <!-- Decorative underline -->
+  <path
+    d="M 180 200 Q 400 220 620 200"
+    stroke="#EC4899"
+    stroke-width="3"
+    fill="none"
+    opacity="0.6"
+    stroke-linecap="round"
+  />
+</svg>

app/src/main/assets/test_chapter_1.html

@@ -0,0 +1,13 @@
+<!-- assets\test_chapter_1.html -->
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <title>Test Chapter 1</title>
+</head>
+<body>
+<p id='first_para'>Hello World</p>
+<p>This is a test chapter for UI testing.</p>
+<p id='search_target'>You can search for the word Espresso.</p>
+<p>Another paragraph with the word espresso but lowercase.</p>
+</body>
+</html>

app/src/main/assets/test_chapter_2.html

@@ -0,0 +1,10 @@
+<!-- assets\test_chapter_2.html -->
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <title>Test Chapter 2</title>
+</head>
+<body>
+<p id='second_chapter_para'>This is the second chapter.</p>
+</body>
+</html>

app/src/main/cpp/CMakeLists.txt

@@ -0,0 +1,95 @@
+# CMakeLists.txt
+# Sets the minimum version of CMake required.
+cmake_minimum_required(VERSION 3.22.1)
+
+# Declares the project name.
+project("reader-native")
+
+set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,-z,max-page-size=16384")
+set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,-z,max-page-size=16384")
+
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIC")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fPIC")
+
+set(CMAKE_POSITION_INDEPENDENT_CODE ON)
+
+# --- CONFIGURE SUBPROJECTS ---
+# Force subprojects to build as static libraries. This is critical for Android.
+set(BUILD_SHARED_LIBS OFF CACHE BOOL "Build shared libraries" FORCE)
+set(BROTLI_DISABLE_TESTS ON CACHE BOOL "Disable Brotli tests" FORCE)
+
+
+# ===================================================================
+# WOFF2 DEPENDENCY SETUP
+# ===================================================================
+# 1. Add the brotli project. This defines the `brotlidec-static` target.
+add_subdirectory(woff2/brotli)
+
+# 2. Manually define the variables that the woff2/CMakeLists.txt script expects.
+set(BROTLIDEC_FOUND TRUE)
+set(BROTLIENC_FOUND TRUE)
+set(BROTLIDEC_INCLUDE_DIRS ${CMAKE_CURRENT_SOURCE_DIR}/woff2/brotli/c/include)
+set(BROTLIENC_INCLUDE_DIRS ${CMAKE_CURRENT_SOURCE_DIR}/woff2/brotli/c/include)
+set(BROTLIDEC_LIBRARIES brotlidec-static)
+set(BROTLIENC_LIBRARIES brotlienc-static)
+
+# 3. Add the woff2 project. This defines the `woff2dec` target.
+add_subdirectory(woff2)
+
+
+# ===================================================================
+# LIBMOBI DEPENDENCY SETUP
+# ===================================================================
+# 4. Set libmobi options before adding it.
+#    We disable libxml2 to use the internal writer, simplifying dependencies.
+#    We also disable encryption for now for the same reason.
+set(USE_LIBXML2 OFF CACHE BOOL "Use libxml2" FORCE)
+set(USE_ENCRYPTION OFF CACHE BOOL "Enable encryption" FORCE)
+
+# Temporarily enable shared libs to build libmobi as a .so file for LGPL compliance.
+set(BUILD_SHARED_LIBS ON)
+# 5. Add the libmobi project. This will define the `mobi` target as a shared library.
+add_subdirectory(libmobi)
+
+set_target_properties(mobi PROPERTIES VERSION "" SOVERSION "")
+# Revert back to building static libs for any subsequent dependencies.
+set(BUILD_SHARED_LIBS OFF)
+
+# Force all symbols in the mobi shared library to be visible.
+# This is necessary because some internal functions we use (like mobi_determine_flowpart_type)
+# are not explicitly exported by the library's public API for shared builds.
+set_target_properties(mobi PROPERTIES C_VISIBILITY_PRESET default)
+
+
+# ===================================================================
+# FINAL NATIVE LIBRARY FOR THE APP
+# ===================================================================
+# 6. Define our final JNI wrapper library.
+#    This single .so file will be loaded by the Android app.
+add_library(
+        native-lib
+        SHARED
+        Woff2Converter.cpp
+        mobi_jni_bridge.c  # The placeholder file you created
+)
+
+# 7. Tell our library where to find all necessary header files.
+target_include_directories(native-lib
+        PRIVATE
+        ${CMAKE_CURRENT_SOURCE_DIR}/woff2/include
+        ${CMAKE_CURRENT_SOURCE_DIR}/libmobi/src
+)
+
+# 8. Find the Android logging and zlib libraries.
+find_library(log-lib log)
+find_library(z-lib z)
+
+# 9. Link our final library against all the static libraries and Android libraries.
+target_link_libraries(
+        native-lib
+        PRIVATE
+        woff2dec      # From woff2
+        mobi          # From libmobi
+        ${log-lib}
+        ${z-lib}      # libmobi requires zlib
+)

app/src/main/cpp/Woff2Converter.cpp

@@ -0,0 +1,56 @@
+#include <jni.h>
+#include <string>
+#include <vector>
+
+// This is the correct header for the public API
+#include <woff2/decode.h>
+
+extern "C" JNIEXPORT jbyteArray JNICALL
+Java_com_aryan_reader_paginatedreader_Woff2Converter_convertWoff2ToTtf(
+        JNIEnv *env,
+        jobject /* this */,
+        jbyteArray woff2_data) {
+
+    // Get the input WOFF2 data from the jbyteArray
+    jbyte* woff2_bytes = env->GetByteArrayElements(woff2_data, nullptr);
+    jsize woff2_size = env->GetArrayLength(woff2_data);
+    const uint8_t* woff2_input = reinterpret_cast<const uint8_t*>(woff2_bytes);
+
+    // Calculate the required size using the correct function name from your header
+    size_t ttf_size = woff2::ComputeWOFF2FinalSize(woff2_input, woff2_size);
+    if (ttf_size == 0) {
+        // This indicates an error in the input font data
+        env->ReleaseByteArrayElements(woff2_data, woff2_bytes, JNI_ABORT);
+        return nullptr;
+    }
+
+    // Create the output buffer
+    std::vector<uint8_t> ttf_output(ttf_size);
+
+    // Perform the conversion using the deprecated function signature that matches your header
+    bool success = woff2::ConvertWOFF2ToTTF(
+            ttf_output.data(), ttf_size,
+            woff2_input, woff2_size
+    );
+
+    // Release the input byte array
+    env->ReleaseByteArrayElements(woff2_data, woff2_bytes, JNI_ABORT);
+
+    // If conversion failed, return null
+    if (!success) {
+        return nullptr;
+    }
+
+    // Create a new Java byte array for the result
+    jbyteArray ttf_data = env->NewByteArray(ttf_size);
+    if (ttf_data == nullptr) {
+        // Out of memory error
+        return nullptr;
+    }
+
+    // Copy the converted data to the Java byte array
+    env->SetByteArrayRegion(ttf_data, 0, ttf_size,
+                            reinterpret_cast<const jbyte*>(ttf_output.data()));
+
+    return ttf_data;
+}

app/src/main/cpp/libmobi/.github/workflows/build.yml

@@ -0,0 +1,101 @@
+name: Build
+
+on:
+  push:
+    branches: [ public ]
+  pull_request:
+    branches: [ public ]
+
+jobs:
+  unix-build:
+
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        shell: bash
+    
+    strategy:
+      fail-fast: false
+      matrix:
+        config:
+          - name: default build with debug
+            options: --enable-debug
+          - name: bulid with internal libs
+            options: --with-zlib=no --with-libxml2=no
+          - name: build without encryption
+            options: --disable-encryption
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: install dependencies
+      run: |
+        if [ "${{ runner.os }}" = "Linux" ]; then
+          sudo apt-get update -qq;
+          sudo apt-get install -y autotools-dev pkg-config automake autoconf libtool;
+          sudo apt-get install -y zlib1g-dev libxml2-dev;
+        elif [ "${{ runner.os }}" = "macOS" ]; then
+          brew update > /dev/null;
+          brew outdated autoconf || brew upgrade autoconf;
+          brew outdated automake || brew upgrade automake;
+          brew outdated libtool || brew upgrade libtool;
+        fi
+    - name: autogen
+      run: ./autogen.sh
+    - name: configure
+      run: ./configure ${{ matrix.config.options }}
+    - name: make
+      run: make -j `nproc`
+    - name: make check
+      run: make -j `nproc` check
+    - name: make distcheck
+      run: make -j `nproc` distcheck
+    - name: upload debug artifacts
+      uses: actions/upload-artifact@v4
+      if: ${{ failure() }}
+      with:
+        name: test-logs-${{ matrix.runs-on }}
+        path: |
+          **/tests/test-suite.log
+          **/tests/samples/*.log
+
+  win64-build:
+
+    runs-on: windows-latest
+    defaults:
+      run:
+        shell: msys2 {0}
+    steps:
+    - name: setup-msys2
+      uses: msys2/setup-msys2@v2
+      with:
+        msystem: MINGW64
+        path-type: minimal
+        update: true
+        install: >-
+          git
+          autotools
+          base-devel
+          mingw-w64-x86_64-toolchain
+          mingw-w64-x86_64-libtool
+          mingw-w64-x86_64-libxml2
+          mingw-w64-x86_64-zlib
+    - name: checkout
+      uses: actions/checkout@v4
+    - name: autogen
+      run: sh ./autogen.sh
+    - name: configure
+      run: ./configure --enable-debug
+    - name: make
+      run: make -j$(nproc)
+    - name: make check
+      run: make -j$(nproc) check
+    - name: make distcheck
+      run: make -j$(nproc) distcheck
+    - name: upload debug artifacts
+      uses: actions/upload-artifact@v4
+      if: ${{ failure() }}
+      with:
+        name: test-logs-${{ matrix.runs-on }}
+        path: |
+          **/tests/test-suite.log
+          **/tests/samples/*.log

app/src/main/cpp/libmobi/.github/workflows/codeql-analysis.yml

@@ -0,0 +1,71 @@
+# For most projects, this workflow file will not need changing; you simply need
+# to commit it to your repository.
+#
+# You may wish to alter this file to override the set of languages analyzed,
+# or to provide custom queries or build logic.
+#
+# ******** NOTE ********
+# We have attempted to detect the languages in your repository. Please check
+# the `language` matrix defined below to confirm you have the correct set of
+# supported CodeQL languages.
+#
+name: "CodeQL"
+
+on:
+  push:
+    branches: [ public ]
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [ public ]
+  schedule:
+    - cron: '19 13 * * 3'
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [ 'cpp' ]
+        # CodeQL supports [ 'cpp', 'csharp', 'go', 'java', 'javascript', 'python' ]
+        # Learn more:
+        # https://docs.github.com/en/free-pro-team@latest/github/finding-security-vulnerabilities-and-errors-in-your-code/configuring-code-scanning#changing-the-languages-that-are-analyzed
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v2
+
+    # Initializes the CodeQL tools for scanning.
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v1
+      with:
+        languages: ${{ matrix.language }}
+        # If you wish to specify custom queries, you can do so here or in a config file.
+        # By default, queries listed here will override any specified in a config file.
+        # Prefix the list here with "+" to use these queries and those in the config file.
+        # queries: ./path/to/local/query, your-org/your-repo/queries@main
+
+    # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
+    # If this step fails, then you should remove it and run the build manually (see below)
+    - name: Autobuild
+      uses: github/codeql-action/autobuild@v1
+
+    # ℹ️ Command-line programs to run using the OS shell.
+    # 📚 https://git.io/JvXDl
+
+    # ✏️ If the Autobuild fails above, remove it and uncomment the following three lines
+    #    and modify them (or add more) to build your code if your project
+    #    uses a compiled language
+
+    #- run: |
+    #   make bootstrap
+    #   make release
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v1

app/src/main/cpp/libmobi/.github/workflows/coverity-scan.yml

@@ -0,0 +1,54 @@
+name: coverity-scan
+
+on:
+  push:
+    branches: [ public ]
+
+jobs:
+  coverity-build:
+
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        shell: bash
+
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        fetch-depth: 0
+    - name: install dependencies
+      run: |
+        sudo apt-get update -qq;
+        sudo apt-get install -y autotools-dev pkg-config automake autoconf libtool;
+        sudo apt-get install -y zlib1g-dev libxml2-dev;
+    - name: download coverity tools
+      run: |
+        curl -Lf \
+          -o cov-analysis-linux64.tar.gz \
+          --form project=bfabiszewski/libmobi \
+          --form token=$TOKEN \
+          https://scan.coverity.com/download/linux64 
+        mkdir cov-analysis-linux64
+        tar xzf cov-analysis-linux64.tar.gz --strip 1 -C cov-analysis-linux64
+      env:
+        TOKEN: ${{ secrets.COVERITY_SCAN_TOKEN }}
+    - name: autogen
+      run: ./autogen.sh
+    - name: configure
+      run: ./configure ${{ matrix.config.options }}
+    - name: build with cov-build
+      run: |
+        export PATH=`pwd`/cov-analysis-linux64/bin:$PATH
+        cov-build --dir cov-int make -j `nproc`
+    - name: upload results to coverity-scan
+      run: |
+        tar czvf cov-int.tgz cov-int
+        curl -Lf \
+          --form token=$TOKEN \
+          --form email=scan.coverity@fabiszewski.net \
+          --form file=@cov-int.tgz \
+          --form version="`git describe --tags`" \
+          --form description="libmobi `git describe --tags`" \
+          "https://scan.coverity.com/builds?project=bfabiszewski/libmobi"
+      env:
+        TOKEN: ${{ secrets.COVERITY_SCAN_TOKEN }}       

app/src/main/cpp/libmobi/.travis.yml

@@ -0,0 +1,39 @@
+os:
+- linux
+# - osx
+language: c
+compiler:
+- clang
+- gcc
+before_install:
+- if [ "$TRAVIS_OS_NAME" == "linux" ]; then
+    sudo apt-get update -qq;
+    sudo apt-get install -y autotools-dev pkg-config automake autoconf libtool;
+    sudo apt-get install -y zlib1g-dev libxml2-dev;
+  elif [ "$TRAVIS_OS_NAME" == "osx" ]; then
+    brew update > /dev/null;
+    brew outdated autoconf || brew upgrade autoconf;
+    brew outdated automake || brew upgrade automake;
+    brew outdated libtool || brew upgrade libtool;
+  fi
+- git config --global user.name "Travis CI (libmobi)"
+- git config --global user.email $HOSTNAME":not-for-mail@travis-ci.org"
+script:
+- ./autogen.sh
+- ./configure --enable-debug && make && make test
+- make clean
+- ./configure --with-zlib=no --with-libxml2=no && make && make test
+
+env:
+  global:
+  - secure: "ShIL3IDvH59cJx4QAKWhVTs7ynCAfID11DqK8pIWJX2UtvXc4pdDQUq6U5ZRLUT0BR6kmLNxYrQUpUKvZ9sYnPuj4X5o9jzXzXsJPXTy/qpjiLK4MCZLIlI4OAHexfAuZTOVZHOoE/B8ABpk8nGYUXk02++LxlmwtE/fIWOOWHs="
+
+addons:
+  coverity_scan:
+    project:
+      name: "bfabiszewski/libmobi"
+      description: "Build submitted via Travis CI"
+    notification_email: scan.coverity@fabiszewski.net
+    build_command_prepend: "./autogen.sh && ./configure"
+    build_command: "make -j 4"
+    branch_pattern: public

app/src/main/cpp/libmobi/CMakeLists.txt

@@ -0,0 +1,118 @@
+# Copyright (c) 2022 Bartek Fabiszewski
+# http://www.fabiszewski.net
+#
+# This file is part of libmobi.
+# Licensed under LGPL, either version 3, or any later.
+# See <http://www.gnu.org/licenses/>
+
+cmake_minimum_required(VERSION 3.12)
+
+project(LIBMOBI C)
+
+set(CMAKE_C_STANDARD 99)
+
+file(STRINGS ${LIBMOBI_SOURCE_DIR}/configure.ac VERSION_LINE REGEX "AC_INIT\\(\\[libmobi\\], \\[(.*)\\]\\)")
+string(REGEX MATCH "([0-9]+\\.[0-9]+)" PACKAGE_VERSION "${VERSION_LINE}")
+message(STATUS "libmobi version ${PACKAGE_VERSION}")
+add_definitions(-DPACKAGE_VERSION="${PACKAGE_VERSION}")
+string(REPLACE "." ";" VERSION_LIST ${PACKAGE_VERSION})
+list(GET VERSION_LIST 0 PACKAGE_VERSION_MAJOR)
+list(GET VERSION_LIST 1 PACKAGE_VERSION_MINOR)
+
+# Option to enable encryption
+option(USE_ENCRYPTION "Enable encryption" ON)
+
+# Option to enable static tools compilation
+option(TOOLS_STATIC "Enable static tools compilation" OFF)
+
+# Option to use libxml2
+option(USE_LIBXML2 "Use libxml2 instead of internal xmlwriter" ON)
+
+# Option to use zlib
+option(USE_ZLIB "Use zlib" ON)
+
+# Option to enable XMLWRITER
+option(USE_XMLWRITER "Enable xmlwriter (for opf support)" ON)
+
+# Option to enable debug
+option(MOBI_DEBUG "Enable debug" OFF)
+
+# Option to enable debug alloc
+option(MOBI_DEBUG_ALLOC "Enable debug alloc" OFF)
+
+option(BUILD_SHARED_LIBS "Build using shared libraries" ON)
+
+if(TOOLS_STATIC)
+    set(BUILD_SHARED_LIBS OFF)
+endif(TOOLS_STATIC)
+
+if(USE_ENCRYPTION)
+    add_definitions(-DUSE_ENCRYPTION)
+endif(USE_ENCRYPTION)
+
+if(USE_XMLWRITER)
+    add_definitions(-DUSE_XMLWRITER)
+    if(USE_LIBXML2)
+        add_definitions(-DUSE_LIBXML2)
+        find_package(LibXml2 REQUIRED)
+        include_directories(${LIBXML2_INCLUDE_DIR})
+    endif(USE_LIBXML2)
+endif(USE_XMLWRITER)
+
+if(MOBI_DEBUG)
+    add_definitions(-DMOBI_DEBUG)
+    message(STATUS "CMAKE_CXX_COMPILER_ID=${CMAKE_C_COMPILER_ID}")
+    if(CMAKE_C_COMPILER_ID MATCHES "Clang|GNU")
+        add_compile_options(-pedantic -Wall -Wextra -Werror)
+    endif()
+endif(MOBI_DEBUG)
+
+if(MOBI_DEBUG_ALLOC)
+    add_definitions(-DMOBI_DEBUG_ALLOC)
+endif(MOBI_DEBUG_ALLOC)
+
+if(USE_ZLIB)
+    find_package(ZLIB REQUIRED)
+    include_directories(${ZLIB_INCLUDE_DIR})
+else()
+    add_definitions(-DUSE_MINIZ)
+endif(USE_ZLIB)
+
+include(CheckIncludeFile)
+include(CheckFunctionExists)
+check_include_file(unistd.h HAVE_UNISTD_H)
+if(HAVE_UNISTD_H)
+    add_definitions(-DHAVE_UNISTD_H)
+endif(HAVE_UNISTD_H)
+check_function_exists(getopt HAVE_GETOPT)
+if(HAVE_GETOPT)
+    add_definitions(-DHAVE_GETOPT)
+endif(HAVE_GETOPT)
+
+check_function_exists(strdup HAVE_STRDUP)
+if(HAVE_STRDUP)
+    add_definitions(-DHAVE_STRDUP)
+endif(HAVE_STRDUP)
+
+check_include_file(sys/resource.h HAVE_SYS_RESOURCE_H)
+if(HAVE_SYS_RESOURCE_H)
+    add_definitions(-DHAVE_SYS_RESOURCE_H)
+endif(HAVE_SYS_RESOURCE_H)
+
+
+include(CheckCSourceCompiles)
+foreach(keyword "inline" "__inline__" "__inline")
+    check_c_source_compiles("${keyword} void func(); void func() { } int main() { func(); return 0; }" HAVE_INLINE)
+    if(HAVE_INLINE)
+        add_definitions(-DMOBI_INLINE=${keyword})
+        break()
+    endif(HAVE_INLINE)
+endforeach(keyword)
+
+check_c_source_compiles("void func() { } __attribute__((noreturn)); int main() { func(); return 0; }" HAVE_ATTRIBUTE_NORETURN)
+if(HAVE_ATTRIBUTE_NORETURN)
+    add_definitions(-DHAVE_ATTRIBUTE_NORETURN)
+endif(HAVE_ATTRIBUTE_NORETURN)
+
+add_subdirectory(src)
+# add_subdirectory(tools)

app/src/main/cpp/libmobi/COPYING

@@ -0,0 +1,165 @@
+                   GNU LESSER GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+
+  This version of the GNU Lesser General Public License incorporates
+the terms and conditions of version 3 of the GNU General Public
+License, supplemented by the additional permissions listed below.
+
+  0. Additional Definitions.
+
+  As used herein, "this License" refers to version 3 of the GNU Lesser
+General Public License, and the "GNU GPL" refers to version 3 of the GNU
+General Public License.
+
+  "The Library" refers to a covered work governed by this License,
+other than an Application or a Combined Work as defined below.
+
+  An "Application" is any work that makes use of an interface provided
+by the Library, but which is not otherwise based on the Library.
+Defining a subclass of a class defined by the Library is deemed a mode
+of using an interface provided by the Library.
+
+  A "Combined Work" is a work produced by combining or linking an
+Application with the Library.  The particular version of the Library
+with which the Combined Work was made is also called the "Linked
+Version".
+
+  The "Minimal Corresponding Source" for a Combined Work means the
+Corresponding Source for the Combined Work, excluding any source code
+for portions of the Combined Work that, considered in isolation, are
+based on the Application, and not on the Linked Version.
+
+  The "Corresponding Application Code" for a Combined Work means the
+object code and/or source code for the Application, including any data
+and utility programs needed for reproducing the Combined Work from the
+Application, but excluding the System Libraries of the Combined Work.
+
+  1. Exception to Section 3 of the GNU GPL.
+
+  You may convey a covered work under sections 3 and 4 of this License
+without being bound by section 3 of the GNU GPL.
+
+  2. Conveying Modified Versions.
+
+  If you modify a copy of the Library, and, in your modifications, a
+facility refers to a function or data to be supplied by an Application
+that uses the facility (other than as an argument passed when the
+facility is invoked), then you may convey a copy of the modified
+version:
+
+   a) under this License, provided that you make a good faith effort to
+   ensure that, in the event an Application does not supply the
+   function or data, the facility still operates, and performs
+   whatever part of its purpose remains meaningful, or
+
+   b) under the GNU GPL, with none of the additional permissions of
+   this License applicable to that copy.
+
+  3. Object Code Incorporating Material from Library Header Files.
+
+  The object code form of an Application may incorporate material from
+a header file that is part of the Library.  You may convey such object
+code under terms of your choice, provided that, if the incorporated
+material is not limited to numerical parameters, data structure
+layouts and accessors, or small macros, inline functions and templates
+(ten or fewer lines in length), you do both of the following:
+
+   a) Give prominent notice with each copy of the object code that the
+   Library is used in it and that the Library and its use are
+   covered by this License.
+
+   b) Accompany the object code with a copy of the GNU GPL and this license
+   document.
+
+  4. Combined Works.
+
+  You may convey a Combined Work under terms of your choice that,
+taken together, effectively do not restrict modification of the
+portions of the Library contained in the Combined Work and reverse
+engineering for debugging such modifications, if you also do each of
+the following:
+
+   a) Give prominent notice with each copy of the Combined Work that
+   the Library is used in it and that the Library and its use are
+   covered by this License.
+
+   b) Accompany the Combined Work with a copy of the GNU GPL and this license
+   document.
+
+   c) For a Combined Work that displays copyright notices during
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+   these notices, as well as a reference directing the user to the
+   copies of the GNU GPL and this license document.
+
+   d) Do one of the following:
+
+       0) Convey the Minimal Corresponding Source under the terms of this
+       License, and the Corresponding Application Code in a form
+       suitable for, and under terms that permit, the user to
+       recombine or relink the Application with a modified version of
+       the Linked Version to produce a modified Combined Work, in the
+       manner specified by section 6 of the GNU GPL for conveying
+       Corresponding Source.
+
+       1) Use a suitable shared library mechanism for linking with the
+       Library.  A suitable mechanism is one that (a) uses at run time
+       a copy of the Library already present on the user's computer
+       system, and (b) will operate properly with a modified version
+       of the Library that is interface-compatible with the Linked
+       Version.
+
+   e) Provide Installation Information, but only if you would otherwise
+   be required to provide such information under section 6 of the
+   GNU GPL, and only to the extent that such information is
+   necessary to install and execute a modified version of the
+   Combined Work produced by recombining or relinking the
+   Application with a modified version of the Linked Version. (If
+   you use option 4d0, the Installation Information must accompany
+   the Minimal Corresponding Source and Corresponding Application
+   Code. If you use option 4d1, you must provide the Installation
+   Information in the manner specified by section 6 of the GNU GPL
+   for conveying Corresponding Source.)
+
+  5. Combined Libraries.
+
+  You may place library facilities that are a work based on the
+Library side by side in a single library together with other library
+facilities that are not Applications and are not covered by this
+License, and convey such a combined library under terms of your
+choice, if you do both of the following:
+
+   a) Accompany the combined library with a copy of the same work based
+   on the Library, uncombined with any other library facilities,
+   conveyed under the terms of this License.
+
+   b) Give prominent notice with the combined library that part of it
+   is a work based on the Library, and explaining where to find the
+   accompanying uncombined form of the same work.
+
+  6. Revised Versions of the GNU Lesser General Public License.
+
+  The Free Software Foundation may publish revised and/or new versions
+of the GNU Lesser General Public License from time to time. Such new
+versions will be similar in spirit to the present version, but may
+differ in detail to address new problems or concerns.
+
+  Each version is given a distinguishing version number. If the
+Library as you received it specifies that a certain numbered version
+of the GNU Lesser General Public License "or any later version"
+applies to it, you have the option of following the terms and
+conditions either of that published version or of any later version
+published by the Free Software Foundation. If the Library as you
+received it does not specify a version number of the GNU Lesser
+General Public License, you may choose any version of the GNU Lesser
+General Public License ever published by the Free Software Foundation.
+
+  If the Library as you received it specifies that a proxy can decide
+whether future versions of the GNU Lesser General Public License shall
+apply, that proxy's public statement of acceptance of any version is
+permanent authorization for you to choose that version for the
+Library.

app/src/main/cpp/libmobi/ChangeLog

@@ -0,0 +1,372 @@
+2024-10-29: Update github actions
+2024-10-29: Fix CMake build, closes #49
+2024-07-04: Minor rewording in man page
+2024-06-17: Fix typo
+2024-06-17: Version 0.12
+2024-02-04: Fix: missing header with libxml2 >= 2.12
+2024-02-04: Max index count value is too low for some dictionaries
+2023-08-10: Fix CMake debug build with MSVC, fixes #46
+2023-07-11: Clean up unused value
+2023-07-11: Fix clang warning about missing function prototypes (-Wstrict-prototypes)
+2023-02-21: Update Xcode project settings
+2023-02-21: Replace deprecated functions
+2023-02-21: Try to reconstruct sources even on broken indices
+2023-02-05: Refactor mobi_buffer_get_varlen_internal to be compatible with other buffer functions. Update documentation with information about mobi_buffer_get_varlen_dec limitation.
+2022-06-26: Fix undefined behavior with null pointer arithmetics in case of corrupt input
+2022-05-28: Version 0.11
+2022-05-27: Fix potential null pointer dereference on corrupt input when inflections CNCX record is not initialized
+2022-05-23: Fix index entries count
+2022-05-23: Prevent leak of index entries on corrupt data
+2022-05-23: Add checks for fragments part in case of corrupt data
+2022-05-17: Fix potential integer overflow with corrupt data
+2022-05-05: Fix: index entry label not being zero-terminated with corrupt input
+2022-05-03: Fix boundary checking error in markup search, that could cause buffer over-read with corrupt input
+2022-05-02: Fix typo in macro name
+2022-04-27: Fix undefined behavior when passing null to strdup
+2022-04-27: Fix wrong boundary checks in inflections parser resulting in stack buffer over-read with corrupt input
+2022-04-26: Fix text formatting
+2022-04-26: Fix array boundary check when parsing inflections which could result in buffer over-read with corrupt input
+2022-04-23: Fix formatting
+2022-04-23: Fix checking boundary of deobfuscation key which could cause buffer over-read with corrupt data
+2022-04-23: Fix issue with corrupt data with empty lookup string which could lead to read beyond buffer
+2022-04-23: Fix faulty checks for array boundary which caused buffer over-read with corrupt input
+2022-04-23: Fix issue with corrupt files with tagvalues_count = 0 that caused null pointer dereference
+2022-04-23: Fix issues when mobi_buffer_getpointer returns null. With corrupt data this could lead to out-of-bounds read
+2022-04-13: Add packaging status [skip ci]
+2022-04-10: Make random generation return proper error codes
+2022-04-10: Rewrite randombytes for libmobi
+2022-04-07: Add libsodium randombytes.c
+2022-04-10: Fix "fallthrough" spelling
+2022-04-10: Make declaration match definition
+2022-04-10: Fix different sign comparison warning
+2022-04-10: Update Xcode project
+2022-04-10: Don't run tests if bash is missing
+2022-04-10: Looking for libxml2, first try pkg-config
+2022-04-04: Update MSVC project
+2022-04-02: Add support for GNU/kFreeBSD and GNU/Hurd
+2022-04-02: Check for inline, noreturn support in CMake
+2022-03-27: Fix format truncation warning
+2022-03-21: Version 0.10
+2022-03-21: Update Xcode project [skip ci]
+2022-03-21: Add functions for retrieving orthographic index entries
+2022-02-27: Add basic CMake support
+2022-02-26: GHA: fetch tags with checkout
+2022-02-26: Minor refactoring of file path manipulation function
+2022-02-26: Fix memory handling issues
+2022-02-26: Add coverity scan workflow
+2022-02-25: Remove obsolete changelog
+2022-02-25: Fix md5sum output on Windows
+2022-02-25: Fix inconsistent separators in path on Windows builds
+2022-02-25: GHA: fix log paths
+2022-02-25: GHA: fix workflow syntax
+2022-02-25: GHA: upload test logs on failure
+2022-02-24: Fix printf format specifier
+2022-02-24: Fix sample path in Makefile
+2022-02-24: Missing autotools in mingw workflow
+2022-02-24: Windows doesn't accept asterisk in file names
+2022-02-24: Update workflow, add badge
+2022-02-24: Add mingw workflow
+2022-02-24: Fix tests in out-of-tree build
+2022-02-24: Update man pages
+2022-02-24: Replace non-portable strptime
+2022-02-24: Make sure both validity period dates are set
+2022-02-21: Fix strptime not found on linux build
+2022-02-21: Add build github action
+2022-02-21: Update README
+2022-02-21: Minor code cleanups
+2022-02-21: Unify boolean and static usage in tools
+2022-02-21: mobimeta: fix null pointer dereference when parsing malformed option
+2022-02-18: Add  hybrid spit option to mobitool
+2022-02-18: Update documentation
+2022-02-18: Test both encrypted hybrid parts
+2022-02-18: Fix: fast decryption routine fails for non-huffman compression
+2022-02-18: Fix mobitool serial decryption
+2022-02-18: Add DRM tests
+2022-02-17: Fix build with encryption disabled
+2022-02-17: Update tests samples
+2022-02-16: Add -h option to tools, update man pages
+2022-02-16: Update Xcode settings
+2022-02-16: Restructure, cleanup encryption related code, add mobidrm tool
+2021-11-19: Improve getopt loop, fix config.h to be accessible from all tools
+2021-11-10: Update xcode project
+2021-11-10: Add functions to split hybrid files
+2021-11-10: Avoid modifying existing records, as caller may keep reference to them
+2021-11-05: Fix: tests fail if pid contains asterisk
+2021-11-05: Fix: decryption may fail for some records with standard compression
+2021-11-05: Replace test samples with self-generated smaller ones
+2021-11-05: Skip test in case of missing checksums
+2021-10-20: Version 0.9
+2021-10-24: Fix out-of-tree build
+2021-10-22: Fix mingw build, code formatting
+2021-10-14: Fix gcc format truncation warning
+2021-10-14: Include autogen.sh in distribution bundle
+2021-10-14: Create codeql-analysis.yml
+2021-10-14: Fix autoconf 2.70 warnings, clean up
+2021-10-14: Build fails with autoconf 2.70
+2021-10-11: Version 0.8
+2021-10-11: Update Xcode project
+2021-10-11: Fix warnings about changed signedness
+2021-09-18: Fix potential out-of-buffer read while parsing corrupt file, closes #38
+2021-09-18: Fix potential out-of-buffer read while parsing corrupt file, closes #35, #36
+2021-09-09: Version 0.7
+2021-09-09: fix oob write bug inside libmobi
+2021-06-07: Add reference to brew formula
+2020-09-02: Fix null pointer dereference in case of broken fragment
+2020-08-01: Update changelog
+2020-08-01: Version 0.6
+2020-07-31: Fix typo
+2020-07-31: Add Readme to dist package
+2020-07-31: Remove anchor on truncated link
+2020-07-31: Fix missing option in man page
+2020-07-30: Include test samples in dist package
+2020-07-25: Fix gcc 7+ warnings about implicit fall through and format truncation
+2020-07-24: Unique names for internal functions to avoid confilicts with static linking
+2020-06-24: Close file in error branch
+2020-06-24: Fix static compilation with miniz on gcc
+2020-06-24: Minor documentation fixes
+2020-06-23: Version 0.5
+2020-06-23: mobitool: add dump cover option
+2020-06-23: Minor documentation improvement
+2020-06-23: Fix potential buffer over-read
+2019-03-18: Fix: try also "name" attribute when searching for link anchor tags, closes #24
+2019-02-22: Add mobi_is_replica function
+2019-02-22: Fix potential read beyond buffer
+2019-02-22: Travis migration
+2018-08-07: Fix: missing items in recreated ncx file
+2018-06-20: Fix: printf format warning on some gcc versions
+2018-06-20: Fix: make dist broken by nonexistent header files
+2018-06-20: VERSION 0.4
+2018-06-20: Fix: buffer overflow (CVE-2018-11726)
+2018-06-20: Fix: buffer overflow (CVE-2018-11724)
+2018-06-20: Fix: read beyond buffer (CVE-2018-11725)
+2018-06-20: Fix: buffer overflow (mobitool), closes #18
+2018-06-20: Fix: read beyond buffer with corrupted KF8 Boundary record, closes #19
+2018-06-20: Fix: read beyond buffer, closes #16, #17
+2018-06-20: Updated xcode project files
+2018-04-03: Fix: ncx part was not scanned for links, fixes #12
+2018-04-02: Fix regression, potential use after free
+2018-04-02: Skip broken resources, fixes #10
+2018-03-05: Allow processing zero length text records, fixes #9
+2017-12-25: Skip broken first resource offset instead of dying
+2017-12-18: Skip broken links reconstruction instead of dying
+2017-11-27: Disable travis OS X builds, as they usually time out
+2017-11-16: Fix: increase max number of dictionary entries per record
+2017-11-14: Fix for some encrypted documents with palmdoc encoding
+2017-11-06: Fix: potential null pointer dereference
+2017-10-16: Manpage cleanup
+2017-09-27: Update README
+2017-09-26: Increase maximum length of attribute name and value, closes #5
+2017-02-26: Remove obsolete files from VS build (closes #3) [ci skip]
+2016-11-05: Mobitool: use epub extension if extracted source resource is epub
+2016-06-10: Update docs
+2016-06-10: Update test files
+2016-06-10: Fix: out of bounds read in corrupt font resource
+2016-06-10: Prevent memory leak in case of corrupt font resources
+2016-06-10: Calculate deobfuscation buffer limit from key length
+2016-06-10: Fix: USE_LIBXML2 macro was not included from config.h
+2016-06-10: Fix: USE_LIBXML2 macro was not included from config.h
+2016-06-09: Fix: memory leak in tools
+2016-06-09: Fix: potential out of bounds read
+2016-06-09: Fix: memory leak in internal xmlwriter
+2016-06-01: Update README
+2016-05-19: Feature: verify decryption key type
+2016-05-19: Cleanup converting little endian buffer to 32-bit integer
+2016-05-19: Feature: check drm expiration dates
+2016-05-18: Fix: memory leaks in encryption
+2016-05-18: Fix concurrent autotools builds
+2016-05-18: use relative path, as $(top_srcdir) fails to be substituted (?)
+2016-05-18: update vcxproj
+2016-05-18: Include headers in automake sources
+2016-05-18: Fix: automake out-of-tree miniz build
+2016-05-18: Fix: wrongly detected fdst record broke some ancient documents
+2016-05-18: Fix: improve index header parsing, some old dictionaries might not load
+2016-05-18: Fix: convert encoding of opf strings from cp1252 indices
+2016-05-18: Quiet warnings about unused values of wiped variables
+2016-05-18: Fix: potential memory leak
+2016-05-18: Fix: wrongly decoded "©" entity
+2016-05-16: Fix: huffdic decompression fails in case of huge documents
+2016-05-14: Simplify buffer_init_null() function
+2016-05-14: Use ARRAYSIZE macro
+2016-05-14: Feature: calculate pid for decryption from device serial number
+2016-04-29: Use endian-independent byte swapping
+2016-04-29: Exclude unused miniz functions from binary
+2016-04-29: Add SHA-1 routines
+2016-04-27: Fix miniz.c formatting
+2016-04-27: Documentation
+2016-04-20: Update changelog
+2016-04-20: Fix potential null pointer dereference
+2016-04-20: Remove useless check
+2016-04-20: Fix text record size calculation
+2016-04-20: Fix buffer checking and freeing
+2016-04-19: Update docs
+2016-04-19: Update ChangeLog
+2016-04-19: Fix comparison between signed and unsigned integer
+2016-04-19: use strdup on linux/glibc
+2016-04-19: Add initial write and metadata editing support. Add mobimeta tool.
+2016-04-19: Always check whether memory allocation succeeded
+2016-04-18: Fix: guarantee array resize step is at least 1
+2016-04-13: Workaround to read some old mobipocket files
+2016-04-13: Improve pdb dates resolving
+2016-04-07: Minor documentation edit
+2016-04-07: Update changelog
+2016-04-06: Fix format warning
+2016-04-06: Update test checksums
+2016-04-06: Fix: <dc:date> "event" attribute needs "opf" namespace
+2016-04-06: Fix: id attributes in ncx file should be unique
+2016-04-06: Store full name in MOBIMobiHeader structure
+2016-04-05: Fix formatting
+2016-04-05: Fix signedness warning
+2016-04-04: Fix potential buffer overflow, closes #2
+2016-04-04: Fix potential null pointer dereference
+2016-03-23: Fix signedness warnings
+2016-03-22: Fix: _mkdir needs direct.h on MinGW
+2016-03-22: Fix tests on Windows
+2016-03-22: Fix: palmdoc decompression may fail with zero byte in input buffer
+2016-03-21: VERSION 03: internal xmlwriter, metadata handling functions, bug fixes
+2016-03-21: Feature: add helper functions for metadata extraction
+2016-03-21: Load also kf8 data when only kf7 version is requested
+2016-03-21: Fix: wrong exth header length check could discard some valid headers
+2016-03-20: Get rid of extended attributes in release archive on OS X
+2016-03-19: Mobitool: add descriptive error messages based on libmobi return codes
+2016-03-04: Add extra length check for CMET record extraction
+2016-03-04: Always check buffer allocation result
+2016-03-04: Add functions to extract conversion source and log, also add this feature to mobitool
+2016-03-04: Remove some stray printfs
+2016-03-03: Remove not used AC_FUNC_MALLOC/REALLOC macros that break cross-compilation
+2016-03-03: Fix potential illegal memory access in miniz.c
+2016-03-03: Fix potential dereference of null pointer in miniz.c
+2016-03-03: Fix for Android bionic libc bug (SIZE_MAX missing in stdint.h)
+2016-03-03: Fix mobitool compilation on MSVC++
+2016-03-03: Add EPUB creation feature to mobitool
+2016-03-02: Fix potential buffer overflow, null pointer dereference
+2016-03-02: Add travis test for no-external-dependency build
+2016-03-02: Fix missing strdup on linux
+2016-03-02: Add internal xmlwriter (as an alternative to libxml2)
+2016-03-01: Feature: decode html entities in exth header strings
+2016-02-29: Fix: potential buffer overflow
+2016-02-29: Fix: wrong pid calculation (regression introduced in 0.2)
+2016-02-26: VERSION 0.2: increased stability, lots of bugs fixed
+2016-02-26: Add Xcode project file
+2016-02-26: Preliminary support for MSVC++ compiler
+2016-02-26: Do not use variable length arrays
+2016-02-26: Refactor mobi_reconstruct_parts() to use MOBIFragment list
+2016-02-26: Fix compiler warning about sign conversion
+2016-02-26: Fix compiler warning about type conversion
+2016-02-26: Check the result of malloc/calloc
+2016-02-26: Fix inconsistent use of const between some definitions and declarations
+2016-02-24: Fix inconsistence between function declaration and definition
+2016-02-24: Fix various potential crashes in case of corrupt input (afl-fuzz)
+2016-02-24: Fix dead code warnings in miniz
+2015-11-26: Export mobi_get_first_resource_record() function
+2015-11-26: Fix: double free on corrupt cdic
+2015-11-02: Update docs
+2015-11-02: Feature: add helper functions to find resources by flow id
+2015-11-02: Feature: export MOBI_NOTSET macro
+2015-11-02: Feature: give more options to parse rawml function
+2015-10-24: Restore travis.yml
+2015-10-24: Fix OSX travis build
+2015-10-24: Fix OSX travis build
+2015-10-24: Fix multiline inline script
+2015-10-24: Enable multi-OS feature
+2015-10-24: Fix: unique temporary name for parallel tests
+2015-10-24: Fix: decoding video resources falsely reported as failed
+2015-10-24: Fix: tests, some md5sum implementations insert double spaces
+2015-10-24: Fix for automake < 1.13
+2015-10-23: Add simple tests framework
+2015-10-23: Fix: increase max index entries per record count, as some rare samples fail
+2015-10-22: Fix: incorrectly decoded video/audio resources
+2015-10-22: Feature: add option to specify output path
+2015-10-14: Add some internal functions to public API: mobi_get_flow_by_uid, mobi_get_resource_by_uid, mobi_get_part_by_uid, mobi_get_exthrecord_by_tag
+2015-06-13: update changelog
+2015-06-13: fix: various invalid memory access
+2015-06-13: don't quit on invalid input, instead substitute with replacement character
+2015-06-12: fix typo
+2015-06-12: update changelog
+2015-06-12: fix: reconstruction failed when there were gaps between fragments
+2015-06-12: add EXTH tags
+2015-06-12: prevent return of garbage value check return value in case of failed malloc
+2015-06-12: fix invalid memory access
+2015-04-12: Fix reconstruction of "kindle:embed" links without mime type (regression)
+2015-04-12: Add sanity checks to link reconstruction functions, allow skipping some malformed patterns
+2015-04-12: Fix infinite loop in guide build while unknown tag was found
+2015-04-12: Increase max recursion level for huffman decompression
+2015-03-28: update docs
+2015-03-28: fix solaris studio compiler warnings
+2015-03-28: fix solaris studio compiler build
+2015-02-18: Fix "more than one: -compatibility_version specified" error on powerpc
+2014-11-24: improve docs
+2014-11-24: simplify public header
+2014-11-21: changelog update [ci skip]
+2014-11-21: README
+2014-11-21: fix: add sanity checks
+2014-11-21: Fix: add sanity checks
+2014-11-21: add sanity check to huffcdic indices count
+2014-11-21: fix number of leaks and other minor issues (by coverity scan)
+2014-11-20: missing notification email kills coverity scan
+2014-11-20: update travis.yml
+2014-11-20: upgrade travis.ml with covert scan
+2014-11-20: update README.md
+2014-11-20: add .travis.yml
+2014-11-20: update REAME.md
+2014-11-20: update README.md
+2014-11-20: update docs
+2014-11-20: feature: add decryption support
+2014-11-20: mkdir cleanup
+2014-11-17: documentation
+2014-11-17: strip unneeded <aid/> tags
+2014-11-16: fix: potential leak
+2014-11-16: fix: regression, some image tags were not reconstructed
+2014-11-16: fix: improve ligatures handling
+2014-11-16: override darwin linker default versioning
+2014-11-15: fix: get proper LIGT entries count from index header
+2014-11-15: feature: unpack records into new folder
+2014-11-14: make README readable on github
+2014-11-14: add README for mobitool
+2014-11-14: fix: dictionaries with large inflection rules failed
+2014-11-14: feature: support encoded ligatures in index entry labels
+2014-11-14: readme
+2014-11-14: update changelog
+2014-11-13: feature: support for older inflections scheme
+2014-11-13: bug: files with short tagx header won't open
+2014-11-13: cleanup unneeded include
+2014-11-13: use strdup on linux/glibc
+2014-11-13: debugging cleanup
+2014-11-13: reorganize source files
+2014-11-13: use strdup on linux/glibc
+2014-11-11: update changelog
+2014-11-11: update changeling
+2014-11-11: fix: documents with text record size > 4096 failed to load
+2014-11-11: add: function to decode flat index entries
+2014-11-11: debug: add functions for debugging indices
+2014-11-11: cleanup
+2014-11-11: fix: variable length value wrongly calculated when going backwards
+2014-11-08: update documentation
+2014-11-08: update changelog
+2014-11-08: add support for reconstructing inflections index entries
+2014-11-08: parsing of exth header failed in some cases
+2014-11-08: fix: some links reconstruction in kf7 failed
+2014-11-08: improve debug info
+2014-11-08: failed malloc false reports
+2014-11-03: fix problem with uncompressed documents
+2014-11-03: fix broken locales
+2014-11-03: remove obsolete includes
+2014-11-03: git log > changelog
+2014-11-03: improved buffer handling
+2014-11-03: improved OPF for dictionaries
+2014-11-03: proper rawml->orth initialization and freeing
+2014-11-03: fix subject field in opf
+2014-11-03: handle UTF-16 surrogates, make ORDT lookups locale independent
+2014-11-01: move dict reconstruction to separate function
+2014-11-01: cleanup
+2014-11-01: quiet gcc warning on printf format
+2014-11-01: reconstruction of orth dictionary entries
+2014-09-27: use mobi_list_del_all()
+2014-09-25: postpone conversion to utf8 after all source reconstructions
+2014-09-24: comment
+2014-09-24: comments
+2014-09-12: doxygen comment
+2014-09-12: data size in comment
+2014-09-05: MOBIArray data type fix
+2014-09-05: config.h fixes
+2014-06-29: merge master
+2014-04-11: initial commit

app/src/main/cpp/libmobi/Makefile.am

@@ -0,0 +1,12 @@
+# project Makefile.am
+
+SUBDIRS = src tools tests
+
+EXTRA_DIST = README.md autogen.sh
+
+test: check
+
+ACLOCAL_AMFLAGS = -I m4
+
+pkgconfigdir = $(libdir)/pkgconfig
+pkgconfig_DATA = libmobi.pc

app/src/main/cpp/libmobi/README.md

@@ -0,0 +1,142 @@
+# Libmobi
+
+C library for handling Mobipocket/Kindle (MOBI) ebook format documents.
+
+Library comes with several [command line tools](https://github.com/bfabiszewski/libmobi/tree/public/tools) for working with mobi ebooks.
+The tools source may also be used as an example on how to use the library.
+
+## Features:
+- reading and parsing:
+  - some older text Palmdoc formats (pdb),
+  - Mobipocket files (prc, mobi),
+  - newer MOBI files including KF8 format (azw, azw3),
+  - Replica Print files (azw4)
+- recreating source files using indices
+- reconstructing references (links and embedded) in html files
+- reconstructing source structure that can be fed back to kindlegen
+- reconstructing dictionary markup (orth, infl tags)
+- writing back loaded documents
+- metadata editing
+- handling encrypted documents
+- encrypting documents for use on eInk Kindles
+
+## Todo:
+- improve writing
+- serialize rawml into raw records
+- process RESC records
+
+## Doxygen documentation:
+- [functions](http://www.fabiszewski.net/libmobi/group__mobi__export.html),
+- [structures for the raw, unparsed records metadata and data](http://www.fabiszewski.net/libmobi/group__raw__structs.html),
+- [structures for the parsed records metadata and data](http://www.fabiszewski.net/libmobi/group__parsed__structs.html),
+- [enums](http://www.fabiszewski.net/libmobi/group__mobi__enums.html)
+
+## Source:
+- [on github](https://github.com/bfabiszewski/libmobi/)
+
+## Packages:
+[![Packaging status](https://repology.org/badge/vertical-allrepos/libmobi.svg)](https://repology.org/project/libmobi/versions)
+
+## Installation:
+
+    [for git] $ ./autogen.sh
+    $ ./configure
+    $ make
+    [optionally] $ make test
+    $ sudo make install
+
+On macOS, you can install via [Homebrew](https://brew.sh/) with `brew install libmobi`.
+
+## Alternative build systems
+- The supported way of building project is by using autotools.
+- Optionally project provides basic support for CMake, Xcode and MSVC++ systems. However these alternative configurations are not covering all options of autotools project. They are also not tested and not updated regularly. 
+
+## Usage
+- single include file: `#include <mobi.h>`
+- linker flag: `-lmobi`
+- basic usage:
+```c
+#include <mobi.h>
+
+/* Initialize main MOBIData structure */
+/* Must be deallocated with mobi_free() when not needed */
+MOBIData *m = mobi_init();
+if (m == NULL) { 
+  return ERROR; 
+}
+
+/* Open file for reading */
+FILE *file = fopen(fullpath, "rb");
+if (file == NULL) {
+  mobi_free(m);
+  return ERROR;
+}
+
+/* Load file into MOBIData structure */
+/* This structure will hold raw data/metadata from mobi document */
+MOBI_RET mobi_ret = mobi_load_file(m, file);
+fclose(file);
+if (mobi_ret != MOBI_SUCCESS) { 
+  mobi_free(m);
+  return ERROR;
+}
+
+/* Initialize MOBIRawml structure */
+/* Must be deallocated with mobi_free_rawml() when not needed */
+/* In the next step this structure will be filled with parsed data */
+MOBIRawml *rawml = mobi_init_rawml(m);
+if (rawml == NULL) {
+  mobi_free(m);
+  return ERROR;
+}
+/* Raw data from MOBIData will be converted to html, css, fonts, media resources */
+/* Parsed data will be available in MOBIRawml structure */
+mobi_ret = mobi_parse_rawml(rawml, m);
+if (mobi_ret != MOBI_SUCCESS) {
+  mobi_free(m);
+  mobi_free_rawml(rawml);
+  return ERROR;
+}
+
+/* Do something useful here */
+/* ... */
+/* For examples how to access data in MOBIRawml structure see mobitool.c */
+
+/* Free MOBIRawml structure */
+mobi_free_rawml(rawml);
+
+/* Free MOBIData structure */
+mobi_free(m);
+
+return SUCCESS;
+```
+- for examples of usage, see [tools](https://github.com/bfabiszewski/libmobi/tree/public/tools)
+
+
+## Requirements
+- compiler supporting C99
+- zlib (optional, configure --with-zlib=no to use included miniz.c instead)
+- libxml2 (optional, configure --with-libxml2=no to use internal xmlwriter)
+- tested with gcc (>=4.2.4), clang (llvm >=3.4), sun c (>=5.13), MSVC++ (2015)
+- builds on Linux, MacOS, Windows (MSVC++, MinGW), Android, Solaris
+- tested architectures: x86, x86-64, arm, ppc
+- works cross-compiled on Kindle :)
+
+## Tests
+- [![Github Action status](https://github.com/bfabiszewski/libmobi/actions/workflows/build.yml/badge.svg)](https://github.com/bfabiszewski/libmobi/actions)
+- [![Travis status](https://travis-ci.com/bfabiszewski/libmobi.svg?branch=public)](https://travis-ci.com/bfabiszewski/libmobi)
+- [![Coverity status](https://scan.coverity.com/projects/3521/badge.svg)](https://scan.coverity.com/projects/3521)
+
+## Projects using libmobi
+- [KyBook 2 Reader](http://kybook-reader.com)
+- [@Voice Aloud Reader](http://www.hyperionics.com/atVoice/)
+- [QLMobi quicklook plugin](https://github.com/bfabiszewski/QLMobi/tree/master/QLMobi)
+- [Librera Reader](http://librera.mobi)
+- ... (let me know to include your project)
+
+## License:
+- LGPL, either version 3, or any later
+
+## Credits:
+- The huffman decompression and KF8 parsing algorithms were learned by studying python source code of [KindleUnpack](https://github.com/kevinhendricks/KindleUnpack).
+- Thanks to all contributors of Mobileread [MOBI wiki](http://wiki.mobileread.com/wiki/MOBI)

app/src/main/cpp/libmobi/autogen.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+mkdir -p m4 && \
+autoreconf --force --install -I m4

app/src/main/cpp/libmobi/configure.ac

@@ -0,0 +1,419 @@
+#                                               -*- Autoconf -*-
+# Process this file with autoconf to produce a configure script.
+
+AC_PREREQ([2.62])
+AC_INIT([libmobi], [0.12])
+AC_CONFIG_SRCDIR([src/buffer.c])
+
+# Enable automake
+AM_INIT_AUTOMAKE([1.11 -Wall foreign subdir-objects])
+# all defined C macros (HAVE_*) will be saved to this file
+AC_CONFIG_HEADERS([config.h])
+AC_CONFIG_MACRO_DIR([m4])
+
+# Checks for programs.
+AC_PROG_CC
+m4_version_prereq([2.70], [], [AC_PROG_CC_C99])
+AM_PROG_CC_C_O
+AC_PROG_INSTALL
+m4_ifdef([AM_PROG_AR], [AM_PROG_AR])
+
+# Init libtool
+m4_ifdef([LT_INIT], [LT_INIT], [AC_PROG_LIBTOOL])
+
+# Checks for libraries.
+
+# Checks for header files.
+AC_HEADER_STDBOOL
+AC_CHECK_HEADERS([stdlib.h string.h utime.h unistd.h sys/resource.h])
+
+# Checks for typedefs, structures, and compiler characteristics.
+AC_TYPE_INT32_T
+AC_TYPE_INT64_T
+AC_TYPE_INT8_T
+AC_TYPE_SIZE_T
+AC_TYPE_UINT16_T
+AC_TYPE_UINT32_T
+AC_TYPE_UINT64_T
+AC_TYPE_UINT8_T
+
+# Checks for library functions.
+AC_FUNC_MKTIME
+AC_CHECK_FUNCS([memmove memset mkdir strdup strpbrk strrchr strstr strtoul utime])
+
+# check for getopt() function
+AC_MSG_CHECKING([for getopt])
+saved_CFLAGS="$CFLAGS"
+CFLAGS="-Werror"
+AC_COMPILE_IFELSE(
+    [AC_LANG_PROGRAM(
+        [[#if HAVE_UNISTD_H
+          # include <unistd.h>
+          #endif]],
+        [[return getopt(0, NULL, NULL);]])],
+    [have_getopt=yes
+     AC_DEFINE([HAVE_GETOPT], [1], [Define whether getopt() function is available])],
+    [have_getopt=no])
+CFLAGS="$saved_CFLAGS"
+AC_MSG_RESULT([$have_getopt])
+AM_CONDITIONAL([USE_INTERNAL_GETOPT], [test x$have_getopt = xno])
+
+# Check for oracle solaris studio c compiler
+AC_CHECK_DECL([__SUNPRO_C], [SUNCC=yes], [SUNCC=no])
+
+# Get rid of extended attributes in release archive on macOS
+case "$host" in
+    *-*-darwin*)
+        am__tar="COPY_EXTENDED_ATTRIBUTES_DISABLE=1 COPYFILE_DISABLE=1 ${am__tar}"
+esac
+
+# Check for -fvisibility=hidden to determine if we can do GNU-style
+# visibility attributes for symbol export control
+AC_MSG_CHECKING([for visibility hidden compiler flag])
+VISIBILITY_HIDDEN=
+if test x$SUNCC = xyes; then
+    # check if we can use -xldscope=hidden
+    saved_CFLAGS="$CFLAGS"
+    CFLAGS="-xldscope=hidden"
+    AC_COMPILE_IFELSE(
+        [AC_LANG_PROGRAM([[]], [[]])],
+        [enable_fvisibility_hidden=yes],
+        [enable_fvisibility_hidden=no])
+    CFLAGS="$saved_CFLAGS"
+
+    AS_IF([test x$enable_fvisibility_hidden = xyes], [VISIBILITY_HIDDEN="-xldscope=hidden"])
+else
+    case "$host" in
+        *-*-mingw*)
+            # on mingw32 we do -fvisibility=hidden and __declspec(dllexport)
+            VISIBILITY_HIDDEN="-fvisibility=hidden"
+            ;;
+        *)
+            # on other compilers, check if we can do -fvisibility=hidden
+            saved_CFLAGS="$CFLAGS"
+            CFLAGS="-fvisibility=hidden -Werror"
+            AC_COMPILE_IFELSE(
+                [AC_LANG_PROGRAM([[]], [[]])],
+                [enable_fvisibility_hidden=yes],
+                [enable_fvisibility_hidden=no])
+            CFLAGS="$saved_CFLAGS"
+
+            AS_IF([test x$enable_fvisibility_hidden = xyes], [VISIBILITY_HIDDEN="-fvisibility=hidden"])
+            ;;
+    esac
+fi
+AC_MSG_RESULT([$VISIBILITY_HIDDEN])
+AC_SUBST([VISIBILITY_HIDDEN])
+
+# MinGW seems to need this
+case "$host" in
+    *-*-mingw*)
+        NO_UNDEFINED="-no-undefined"
+        AVOID_VERSION="-avoid-version"
+        ISO99_SOURCE="-D_ISOC99_SOURCE=1"
+        WIN32=yes
+        ;;
+    *)
+        NO_UNDEFINED=
+        AVOID_VERSION=
+        ISO99_SOURCE=
+        WIN32=no
+        ;;
+esac
+AC_SUBST([NO_UNDEFINED])
+AC_SUBST([AVOID_VERSION])
+AC_SUBST([ISO99_SOURCE])
+AC_SUBST([WIN32])
+
+# Override default versioning of Darwin linker
+case "$host" in
+    *-*-darwin*)
+        case "$host" in
+            # exclude ppc as it breaks linker
+            ppc-* | powerpc-*)
+                DARWIN_LDFLAGS=
+                ;;
+            *)
+                MAJOR=`echo "${PACKAGE_VERSION}" | cut -d . -f 1`
+                DARWIN_LDFLAGS="-Wl,-compatibility_version,${MAJOR} -Wl,-current_version,${PACKAGE_VERSION}"
+                ;;
+        esac
+        ;;
+    *)
+        DARWIN_LDFLAGS=
+        ;;
+esac
+AC_SUBST([DARWIN_LDFLAGS])
+
+# Check for --allow-multiple-definition support in linker
+AC_MSG_CHECKING([whether linker supports --allow-multiple-definition flag])
+MOBI_ALLOW_MULTIPLE=
+saved_CFLAGS="$CFLAGS"
+CFLAGS="-Wl,--allow-multiple-definition -Werror"
+AC_COMPILE_IFELSE(
+    [AC_LANG_PROGRAM([[]], [[]])],
+    [def_allow_multiple=yes],
+    [def_allow_multiple=no])
+CFLAGS="$saved_CFLAGS"
+AS_IF([test x$def_allow_multiple = xyes], [MOBI_ALLOW_MULTIPLE="-Wl,--allow-multiple-definition"])
+AC_MSG_RESULT([$def_allow_multiple])
+AC_SUBST([MOBI_ALLOW_MULTIPLE])
+
+# Check for non-broken inline under various spellings
+AC_MSG_CHECKING([for inline keyword])
+def_inline=""
+for inline_key in inline __inline__ __inline
+do
+    AC_COMPILE_IFELSE(
+        [AC_LANG_PROGRAM(
+            [[]],
+            [[} $inline_key int foo() { return 0; } int bar() { return foo();]])],
+        [def_inline=$inline_key; break])
+done
+AC_MSG_RESULT([$def_inline])
+AC_DEFINE_UNQUOTED([MOBI_INLINE], [$def_inline], [How to obtain function inlining.])
+
+# Check for noreturn attribute support
+AC_MSG_CHECKING([whether compiler supports noreturn attribute])
+AC_LINK_IFELSE(
+    [AC_LANG_PROGRAM([[]], [[void foo( void ) __attribute__((noreturn));]])],
+    [AC_MSG_RESULT([yes])
+     AC_DEFINE([HAVE_ATTRIBUTE_NORETURN], [1], [Define to 1 if compiler supports __attribute__((noreturn))])],
+    [AC_MSG_RESULT([no])]
+)
+
+# Check --enable-xmlwriter
+XMLWRITER_OPT=""
+AC_MSG_CHECKING([whether enable xmlwriter (for opf support)])
+AC_ARG_ENABLE(
+    [xmlwriter],
+    [AS_HELP_STRING([--enable-xmlwriter], [enable xmlwriter (for opf support) @<:@default=yes@:>@])],
+    [case "$enableval" in
+         yes) xmlwriter=yes ;;
+         no)  xmlwriter=no ;;
+         *)   AC_MSG_ERROR([bad value $enableval for --enable-xmlwriter]) ;;
+     esac],
+    [xmlwriter=yes])
+AC_MSG_RESULT([$xmlwriter])
+AM_CONDITIONAL([USE_XMLWRITER], [test x$xmlwriter = xyes])
+if test x$xmlwriter = xyes; then
+    AC_DEFINE([USE_XMLWRITER], [1], [Define whether enable xmlwriter (for opf support)])
+
+    # test for --with-libxml2
+    AC_MSG_CHECKING([whether compile with libxml2])
+    AC_ARG_WITH(
+        [libxml2],
+        [AS_HELP_STRING([--with-libxml2], [Use libxml2 instead of internal xmlwriter @<:@default=yes@:>@])],
+        [if test "x$withval" = xyes; then use_libxml2=yes; else use_libxml2=no; fi],
+        [use_libxml2=yes])
+    AC_MSG_RESULT([$use_libxml2])
+
+    if test x$use_libxml2 = xyes; then
+        AC_ARG_VAR([XML2_CONFIG], [path to xml2-config utility])
+        AC_CHECK_PROGS([XML2_CONFIG], [xml2-config])
+        AC_CHECK_PROGS([PKG_CONFIG], [pkg-config])
+        AC_MSG_CHECKING([for libxml2 path supplier])
+        if test -n "$PKG_CONFIG" && $PKG_CONFIG --exists libxml-2.0; then
+            LIBXML2_CFLAGS="`$PKG_CONFIG --cflags libxml-2.0`"
+            LIBXML2_LDFLAGS="`$PKG_CONFIG --libs libxml-2.0`"
+            AC_MSG_RESULT([pkg-config])
+        elif test -n "$XML2_CONFIG"; then
+            LIBXML2_CFLAGS="`$XML2_CONFIG --cflags`"
+            LIBXML2_LDFLAGS="`$XML2_CONFIG --libs`"
+            AC_MSG_RESULT([xml2-config])
+        else
+            LIBXML2_CFLAGS=-I/usr/include/libxml2
+            LIBXML2_LDFLAGS=-lxml2
+            AC_MSG_RESULT([generic])
+        fi
+        saved_CPPFLAGS=$CPPFLAGS
+        CPPFLAGS="$CPPFLAGS $LIBXML2_CFLAGS"
+        AC_CHECK_HEADER(
+            [libxml/xmlwriter.h],
+            [AC_DEFINE([USE_LIBXML2], [1], [Define if you want to use libxml2 library])],
+            [AC_MSG_ERROR([couldn't find libxml2])])
+        CPPFLAGS=$saved_CPPFLAGS
+    else
+        LIBXML2_LDFLAGS=
+        LIBXML2_CFLAGS=
+    fi
+    AC_SUBST([LIBXML2_LDFLAGS])
+    AC_SUBST([LIBXML2_CFLAGS])
+    XMLWRITER_OPT="yes"
+fi
+AM_CONDITIONAL([USE_LIBXML2], [test x$use_libxml2 = xyes])
+AC_SUBST([XMLWRITER_OPT])
+
+# Check --enable-encryption
+ENCRYPTION_OPT=""
+AC_MSG_CHECKING([whether enable encryption])
+AC_ARG_ENABLE(
+    [encryption],
+    [AS_HELP_STRING([--enable-encryption], [enable encryption @<:@default=yes@:>@])],
+    [case "$enableval" in
+         yes) encryption=yes ;;
+         no)  encryption=no ;;
+         *)   AC_MSG_ERROR([bad value $enableval for --enable-encryption]) ;;
+     esac],
+    [encryption=yes])
+AC_MSG_RESULT([$encryption])
+AM_CONDITIONAL([USE_ENCRYPTION], [test x$encryption = xyes])
+if test x$encryption = xyes; then
+    AC_DEFINE([USE_ENCRYPTION], [1], [Enable encryption])
+    ENCRYPTION_OPT="yes"
+
+    AC_CHECK_HEADERS([sys/random.h])
+    AC_MSG_CHECKING([for getrandom with a standard API])
+    AC_LINK_IFELSE(
+        [AC_LANG_PROGRAM(
+            [[#include <stdlib.h>
+              #ifdef HAVE_UNISTD_H
+              # include <unistd.h>
+              #endif
+              #ifdef HAVE_SYS_RANDOM_H
+              # include <sys/random.h>
+              #endif]],
+            [[unsigned char buf;
+              if (&getrandom != NULL) {
+                (void) getrandom((void *) &buf, 1U, 0U);
+              }]])],
+        [AC_MSG_RESULT([yes])
+         AC_CHECK_FUNCS([getrandom])],
+        [AC_MSG_RESULT([no])])
+
+fi
+AC_SUBST([ENCRYPTION_OPT])
+
+# Check --enable-debug
+AC_MSG_CHECKING([whether enable debugging])
+AC_ARG_ENABLE(
+    [debug],
+    [AS_HELP_STRING([--enable-debug], [enable debugging @<:@default=no@:>@])],
+    [case "$enableval" in
+         yes) debug=yes ;;
+         no)  debug=no ;;
+         *)   AC_MSG_ERROR([bad value $enableval for --enable-debug]) ;;
+     esac],
+    [debug=no])
+AC_MSG_RESULT([$debug])
+
+DEBUG_CFLAGS=
+if test x$debug = xyes; then
+    AC_DEFINE([MOBI_DEBUG], [1], [Enable debugging])
+    if test x$SUNCC = xyes; then
+        DEBUG_CFLAGS="-v -errwarn"
+    else
+        DEBUG_CFLAGS="-pedantic -Wall -Wextra -Werror"
+    fi
+fi
+AC_SUBST([DEBUG_CFLAGS])
+
+# Check --enable-debug-alloc
+AC_MSG_CHECKING([whether enable alloc debugging])
+AC_ARG_ENABLE(
+    [debug_alloc],
+    [AS_HELP_STRING([--enable-debug-alloc], [enable memory allocation debugging @<:@default=no@:>@])],
+    [case "$enableval" in
+         yes) debug_alloc=yes ;;
+         no)  debug_alloc=no ;;
+         *)   AC_MSG_ERROR([bad value $enableval for --enable-debug-alloc]) ;;
+     esac],
+    [debug_alloc=no])
+AC_MSG_RESULT([$debug_alloc])
+
+if test x$debug_alloc = xyes; then
+    AC_DEFINE([MOBI_DEBUG_ALLOC], [1], [Enable alloc debugging])
+fi
+
+# Check --enable-tools-static
+AC_MSG_CHECKING([whether link tools against static libmobi])
+AC_ARG_ENABLE(
+    [tools_static],
+    [AS_HELP_STRING([--enable-tools-static], [link tools against static libmobi @<:@default=no@:>@])],
+    [case "$enableval" in
+         yes) tools_static=yes ;;
+         no)  tools_static=no ;;
+         *)   AC_MSG_ERROR([bad value $enableval for --enable-tools-static]) ;;
+     esac],
+    [tools_static=no])
+AC_MSG_RESULT([$tools_static])
+TOOLS_STATIC=
+if test x$tools_static = xyes; then
+    TOOLS_STATIC="-static"
+fi
+AC_SUBST([TOOLS_STATIC])
+
+# test for --with-zlib
+AC_MSG_CHECKING([whether compile with zlib])
+AC_ARG_WITH(
+    [zlib],
+    [AS_HELP_STRING([--with-zlib], [Use zlib instead of included miniz @<:@default=yes@:>@])],
+    [if test "x$withval" = xyes; then use_zlib=yes; else use_zlib=no; fi],
+    [use_zlib=yes])
+AC_MSG_RESULT([$use_zlib])
+AM_CONDITIONAL([USE_ZLIB], [test x$use_zlib = xyes])
+AM_CONDITIONAL([USE_MINIZ], [test x$use_zlib = xno])
+AM_CONDITIONAL([USE_STATIC], [test x$tools_static = xyes])
+if test x$use_zlib = xyes; then
+    AC_CHECK_HEADER(
+        [zlib.h],
+        [AC_DEFINE([USE_ZLIB], [1], [Define if you want to use system zlib library])
+         LIBZ_LDFLAGS=-lz
+         MINIZ_CFLAGS=],
+        [AC_MSG_ERROR([couldn't find zlib header])])
+else
+    AC_DEFINE([USE_MINIZ], [1], [Define if you want to use included miniz library])
+    MINIZ_CFLAGS="-D_POSIX_C_SOURCE=200112L"
+    LIBZ_LDFLAGS=
+fi
+AC_SUBST([LIBZ_LDFLAGS])
+AC_SUBST([MINIZ_CFLAGS])
+
+# Check for md5 or md5sum program, needed for tests
+AC_ARG_VAR([MD5PROG], [md5 hashing program executable])
+AS_IF([test -z "$MD5PROG"], [AC_CHECK_PROG([MD5PROG], [md5sum], [md5sum -t])], [])
+AS_IF([test -z "$MD5PROG"], [AC_CHECK_PROG([MD5PROG], [md5], [md5 -r])], [])
+AS_IF([test -z "$MD5PROG"], [AC_MSG_WARN([md5 hashing program not found, some tests will be skipped])], [])
+AC_PATH_PROG([BASH_PATH], [bash])
+AS_IF(
+    [test -z "$BASH_PATH"],
+    [AC_MSG_WARN([bash not found, tests will be skipped])
+     RUN_TESTS="no"],
+    [RUN_TESTS="yes"
+     AC_SUBST([BASH_PATH])])
+AC_SUBST([RUN_TESTS])
+
+if test x$RUN_TESTS = xyes; then
+    # List test files
+    cur_dir=`pwd`
+    cd "$srcdir"/tests
+
+    for sample_path in samples/*.mobi
+    do
+        TESTLIST="${TESTLIST} ${sample_path} \\
+"
+    done
+    for sample_path in samples/*.fail
+    do
+        TESTLIST="${TESTLIST} ${sample_path} \\
+"
+        FAILLIST="${FAILLIST} ${sample_path} \\
+"
+    done
+    cd $cur_dir
+fi
+
+AC_SUBST([TESTLIST])
+AC_SUBST([FAILLIST])
+
+AC_CONFIG_FILES([Makefile])
+AC_CONFIG_FILES([libmobi.pc])
+AC_CONFIG_FILES([src/Makefile])
+AC_CONFIG_FILES([tools/Makefile])
+AC_CONFIG_FILES([tools/mobitool.1])
+AC_CONFIG_FILES([tools/mobimeta.1])
+AC_CONFIG_FILES([tools/mobidrm.1])
+AC_CONFIG_FILES([tests/Makefile])
+AC_CONFIG_FILES([tests/test.sh], [chmod +x tests/test.sh])
+
+AC_OUTPUT

app/src/main/cpp/libmobi/libmobi.pc.in

@@ -0,0 +1,13 @@
+prefix=@prefix@
+exec_prefix=@exec_prefix@
+libdir=@libdir@
+includedir=@includedir@
+
+Name: libmobi
+Description: MOBI ebook format handling library
+URL: http://www.fabiszewski.net/libmobi
+Version: @VERSION@
+Requires:
+Libs: -L${libdir} -lmobi
+Libs.private: @LIBZ_LDFLAGS@ @LIBXML2_LDFLAGS@
+Cflags: -I${includedir}

app/src/main/cpp/libmobi/mobi.xcodeproj/project.pbxproj

@@ -0,0 +1,879 @@
+// !$*UTF8*$!
+{
+	archiveVersion = 1;
+	classes = {
+	};
+	objectVersion = 46;
+	objects = {
+
+/* Begin PBXBuildFile section */
+		1502448F1CD3A18F0075F4EC /* sha1.c in Sources */ = {isa = PBXBuildFile; fileRef = 1502448D1CD3A18F0075F4EC /* sha1.c */; };
+		150244901CD3A18F0075F4EC /* sha1.h in Headers */ = {isa = PBXBuildFile; fileRef = 1502448E1CD3A18F0075F4EC /* sha1.h */; };
+		1504FD851CBE880B002AA042 /* meta.c in Sources */ = {isa = PBXBuildFile; fileRef = 1504FD831CBE880B002AA042 /* meta.c */; };
+		1504FD861CBE880B002AA042 /* meta.h in Headers */ = {isa = PBXBuildFile; fileRef = 1504FD841CBE880B002AA042 /* meta.h */; };
+		150A318D18E19BF9001A7AD7 /* write.c in Sources */ = {isa = PBXBuildFile; fileRef = 150A318C18E19BF9001A7AD7 /* write.c */; };
+		151A46661909312900FAF3F4 /* miniz.c in Sources */ = {isa = PBXBuildFile; fileRef = 151A46651909312900FAF3F4 /* miniz.c */; settings = {COMPILER_FLAGS = "-w"; }; };
+		152FD1E6270509A900AF276A /* randombytes.h in Headers */ = {isa = PBXBuildFile; fileRef = 152FD1E4270509A900AF276A /* randombytes.h */; };
+		152FD1E7270509A900AF276A /* randombytes.c in Sources */ = {isa = PBXBuildFile; fileRef = 152FD1E5270509A900AF276A /* randombytes.c */; };
+		153D91DB18E9630000E807B6 /* memory.c in Sources */ = {isa = PBXBuildFile; fileRef = 153D91DA18E9630000E807B6 /* memory.c */; };
+		1543065B1CB78A45006AB398 /* mobimeta.c in Sources */ = {isa = PBXBuildFile; fileRef = 151185A31CB6C28500201C8A /* mobimeta.c */; };
+		1543065E1CB78BA8006AB398 /* libmobi.dylib in Frameworks */ = {isa = PBXBuildFile; fileRef = 150039BB18E06BC100D33077 /* libmobi.dylib */; };
+		154C2D401CC64A170041DD0E /* common.c in Sources */ = {isa = PBXBuildFile; fileRef = 154C2D3E1CC64A170041DD0E /* common.c */; };
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app/src/main/cpp/libmobi/msvc/libmobi.sln

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app/src/main/cpp/libmobi/msvc/libmobi.vcxproj

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+    <Linkage-libxml2>static</Linkage-libxml2>
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+    <Linkage-libxml2>static</Linkage-libxml2>
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+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
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+      <Command>for /f "tokens=4 delims=[]" %%a in ('type "$(SolutionDir)..\configure.ac" ^| find "AC_INIT"') do (
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app/src/main/cpp/libmobi/msvc/mobidrm/mobidrm.vcxproj

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app/src/main/cpp/libmobi/msvc/mobidrm/packages.config

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app/src/main/cpp/libmobi/msvc/mobimeta/mobimeta.vcxproj

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app/src/main/cpp/libmobi/msvc/mobimeta/packages.config

@@ -0,0 +1,5 @@
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app/src/main/cpp/libmobi/msvc/mobitool/mobitool.vcxproj

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app/src/main/cpp/libmobi/msvc/mobitool/packages.config

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<packages>
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+  <package id="zlib128-vc140-static-32_64" version="1.2.8" targetFramework="native" />
+</packages>

app/src/main/cpp/libmobi/msvc/packages.config

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<packages>
+  <package id="libxml2-vc140-static-32_64" version="2.9.4.1" targetFramework="native" />
+  <package id="zlib128-vc140-static-32_64" version="1.2.8" targetFramework="native" />
+</packages>

app/src/main/cpp/libmobi/src/CMakeLists.txt

@@ -0,0 +1,87 @@
+# Copyright (c) 2022 Bartek Fabiszewski
+# http://www.fabiszewski.net
+#
+# This file is part of libmobi.
+# Licensed under LGPL, either version 3, or any later.
+# See <http://www.gnu.org/licenses/>
+
+set(mobi_SOURCES
+	${CMAKE_CURRENT_SOURCE_DIR}/buffer.c
+	${CMAKE_CURRENT_SOURCE_DIR}/buffer.h
+	${CMAKE_CURRENT_SOURCE_DIR}/compression.c
+	${CMAKE_CURRENT_SOURCE_DIR}/compression.h
+	${CMAKE_CURRENT_SOURCE_DIR}/config.h
+	${CMAKE_CURRENT_SOURCE_DIR}/debug.c
+	${CMAKE_CURRENT_SOURCE_DIR}/debug.h
+	${CMAKE_CURRENT_SOURCE_DIR}/index.c
+	${CMAKE_CURRENT_SOURCE_DIR}/index.h
+	${CMAKE_CURRENT_SOURCE_DIR}/memory.c
+	${CMAKE_CURRENT_SOURCE_DIR}/memory.h
+	${CMAKE_CURRENT_SOURCE_DIR}/meta.c
+	${CMAKE_CURRENT_SOURCE_DIR}/meta.h
+	${CMAKE_CURRENT_SOURCE_DIR}/mobi.h
+	${CMAKE_CURRENT_SOURCE_DIR}/parse_rawml.c
+	${CMAKE_CURRENT_SOURCE_DIR}/parse_rawml.h
+	${CMAKE_CURRENT_SOURCE_DIR}/read.c
+	${CMAKE_CURRENT_SOURCE_DIR}/read.h
+	${CMAKE_CURRENT_SOURCE_DIR}/structure.c
+	${CMAKE_CURRENT_SOURCE_DIR}/structure.h
+	${CMAKE_CURRENT_SOURCE_DIR}/util.c
+	${CMAKE_CURRENT_SOURCE_DIR}/util.h
+	${CMAKE_CURRENT_SOURCE_DIR}/write.c
+	${CMAKE_CURRENT_SOURCE_DIR}/write.h
+)
+
+if(USE_ENCRYPTION)
+	list(APPEND mobi_SOURCES ${CMAKE_CURRENT_SOURCE_DIR}/encryption.c
+							 ${CMAKE_CURRENT_SOURCE_DIR}/encryption.h
+							 ${CMAKE_CURRENT_SOURCE_DIR}/sha1.c
+							 ${CMAKE_CURRENT_SOURCE_DIR}/sha1.h
+							 ${CMAKE_CURRENT_SOURCE_DIR}/randombytes.c
+							 ${CMAKE_CURRENT_SOURCE_DIR}/randombytes.h)
+endif(USE_ENCRYPTION)
+
+if(USE_XMLWRITER)
+	list(APPEND mobi_SOURCES ${CMAKE_CURRENT_SOURCE_DIR}/opf.c
+							 ${CMAKE_CURRENT_SOURCE_DIR}/opf.h)
+	if(NOT USE_LIBXML2)
+		list(APPEND mobi_SOURCES ${CMAKE_CURRENT_SOURCE_DIR}/xmlwriter.c
+								 ${CMAKE_CURRENT_SOURCE_DIR}/xmlwriter.h)
+	endif(NOT USE_LIBXML2)
+endif(USE_XMLWRITER)
+
+
+add_library(mobi ${mobi_SOURCES})
+
+set_target_properties(mobi PROPERTIES
+                      OUTPUT_NAME "mobi"
+                      SOVERSION ${PACKAGE_VERSION_MAJOR}
+                      VERSION "${PACKAGE_VERSION}"
+					  POSITION_INDEPENDENT_CODE ${BUILD_SHARED_LIBS}
+					  C_VISIBILITY_PRESET hidden
+					  VISIBILITY_INLINES_HIDDEN ON
+					  MACOSX_RPATH 1)
+
+if(USE_MINIZ)
+	set(miniz_SOURCES
+		${CMAKE_CURRENT_SOURCE_DIR}/miniz.c
+		${CMAKE_CURRENT_SOURCE_DIR}/miniz.h
+	)
+	add_library(miniz OBJECT ${miniz_SOURCES})
+	target_compile_definitions(miniz PRIVATE
+							   MINIZ_NO_STDIO
+							   MINIZ_NO_ZLIB_COMPATIBLE_NAMES
+							   MINIZ_NO_TIME
+							   MINIZ_NO_ARCHIVE_APIS
+							   MINIZ_NO_ARCHIVE_WRITING_APIS
+							   _POSIX_C_SOURCE=200112L)
+	target_link_libraries(mobi PRIVATE miniz)
+endif(USE_MINIZ)
+
+if(USE_LIBXML2)
+	target_link_libraries(mobi PUBLIC LibXml2::LibXml2)
+endif(USE_LIBXML2)
+
+if(USE_ZLIB)
+	target_link_libraries(mobi PUBLIC ZLIB::ZLIB)
+endif(USE_ZLIB)

app/src/main/cpp/libmobi/src/Makefile.am

@@ -0,0 +1,27 @@
+# libmobi 
+
+lib_LTLIBRARIES = libmobi.la
+libmobi_la_SOURCES = buffer.c buffer.h compression.c compression.h config.h debug.c debug.h index.c index.h memory.c memory.h \
+meta.c meta.h parse_rawml.c parse_rawml.h read.c read.h structure.c structure.h util.c util.h write.c write.h
+
+if USE_XMLWRITER
+libmobi_la_SOURCES += opf.c opf.h
+if !USE_LIBXML2
+libmobi_la_SOURCES += xmlwriter.c xmlwriter.h
+endif
+endif
+if USE_ENCRYPTION
+libmobi_la_SOURCES += encryption.c encryption.h randombytes.c randombytes.h sha1.c sha1.h
+endif
+EXTRA_LTLIBRARIES = libminiz.la
+libminiz_la_SOURCES = miniz.c miniz.h
+libminiz_la_CFLAGS = $(VISIBILITY_HIDDEN) $(MINIZ_CFLAGS) \
+-DMINIZ_NO_STDIO -DMINIZ_NO_ZLIB_COMPATIBLE_NAMES \
+-DMINIZ_NO_TIME -DMINIZ_NO_ARCHIVE_APIS -DMINIZ_NO_ARCHIVE_WRITING_APIS
+libminiz_la_LDFLAGS =
+if USE_MINIZ
+libmobi_la_LIBADD = libminiz.la
+endif
+include_HEADERS = mobi.h
+libmobi_la_LDFLAGS = $(AVOID_VERSION) $(NO_UNDEFINED) $(DARWIN_LDFLAGS) $(LIBZ_LDFLAGS) $(LIBXML2_LDFLAGS)
+libmobi_la_CFLAGS = $(VISIBILITY_HIDDEN) $(ISO99_SOURCE) $(DEBUG_CFLAGS) $(LIBXML2_CFLAGS)

app/src/main/cpp/libmobi/src/buffer.c

@@ -0,0 +1,637 @@
+/** @file buffer.c
+ *  @brief Functions to read/write raw big endian data
+ *
+ * Copyright (c) 2014 Bartek Fabiszewski
+ * http://www.fabiszewski.net
+ *
+ * This file is part of libmobi.
+ * Licensed under LGPL, either version 3, or any later.
+ * See <http://www.gnu.org/licenses/>
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include "buffer.h"
+#include "debug.h"
+
+/**
+ @brief Initializer for MOBIBuffer structure
+ 
+ It allocates memory for structure and for data.
+ Memory should be freed with mobi_buffer_free().
+ 
+ @param[in] len Size of data to be allocated for the buffer
+ @return MOBIBuffer on success, NULL otherwise
+ */
+MOBIBuffer * mobi_buffer_init(const size_t len) {
+    unsigned char *data = malloc(len);
+    if (data == NULL) {
+        debug_print("%s", "Buffer data allocation failed\n");
+        return NULL;
+    }
+    MOBIBuffer *buf = mobi_buffer_init_null(data, len);
+    if (buf == NULL) {
+        free(data);
+    }
+    return buf;
+}
+
+/**
+ @brief Initializer for MOBIBuffer structure
+ 
+ It allocates memory for structure but, unlike mobi_buffer_init(), it does not allocate memory for data.
+ Instead it works on external data.
+ Memory should be freed with mobi_buffer_free_null() (buf->data will not be deallocated).
+ 
+ @param[in,out] data Set data as buffer data
+ @param[in] len Size of data held by the buffer
+ @return MOBIBuffer on success, NULL otherwise
+ */
+MOBIBuffer * mobi_buffer_init_null(unsigned char *data, const size_t len) {
+    MOBIBuffer *buf = malloc(sizeof(MOBIBuffer));
+    if (buf == NULL) {
+        debug_print("%s", "Buffer allocation failed\n");
+        return NULL;
+    }
+    buf->data = data;
+    buf->offset = 0;
+    buf->maxlen = len;
+    buf->error = MOBI_SUCCESS;
+    return buf;
+}
+
+/**
+ @brief Resize buffer
+ 
+ Smaller size than offset will cause data truncation.
+ 
+ @param[in,out] buf MOBIBuffer structure to be filled with data
+ @param[in] newlen New buffer size
+ */
+void mobi_buffer_resize(MOBIBuffer *buf, const size_t newlen) {
+    unsigned char *tmp = realloc(buf->data, newlen);
+    if (tmp == NULL) {
+        debug_print("%s", "Buffer allocation failed\n");
+        buf->error = MOBI_MALLOC_FAILED;
+        return;
+    }
+    buf->data = tmp;
+    buf->maxlen = newlen;
+    if (buf->offset >= newlen) {
+        buf->offset = newlen - 1;
+    }
+    debug_print("Buffer successfully resized to %zu\n", newlen);
+    buf->error = MOBI_SUCCESS;
+}
+
+/**
+ @brief Adds 8-bit value to MOBIBuffer
+ 
+ @param[in,out] buf MOBIBuffer structure to be filled with data
+ @param[in] data Integer to be put into the buffer
+ */
+void mobi_buffer_add8(MOBIBuffer *buf, const uint8_t data) {
+    if (buf->offset + 1 > buf->maxlen) {
+        debug_print("%s", "Buffer full\n");
+        buf->error = MOBI_BUFFER_END;
+        return;
+    }
+    buf->data[buf->offset++] = data;
+}
+
+/**
+ @brief Adds 16-bit value to MOBIBuffer
+ 
+ @param[in,out] buf MOBIBuffer structure to be filled with data
+ @param[in] data Integer to be put into the buffer
+ */
+void mobi_buffer_add16(MOBIBuffer *buf, const uint16_t data) {
+    if (buf->offset + 2 > buf->maxlen) {
+        debug_print("%s", "Buffer full\n");
+        buf->error = MOBI_BUFFER_END;
+        return;
+    }
+    unsigned char *buftr = buf->data + buf->offset;
+    *buftr++ = (uint8_t)((uint32_t)(data & 0xff00U) >> 8);
+    *buftr = (uint8_t)((uint32_t)(data & 0xffU));
+    buf->offset += 2;
+}
+
+/**
+ @brief Adds 32-bit value to MOBIBuffer
+ 
+ @param[in,out] buf MOBIBuffer structure to be filled with data
+ @param[in] data Integer to be put into the buffer
+ */
+void mobi_buffer_add32(MOBIBuffer *buf, const uint32_t data) {
+    if (buf->offset + 4 > buf->maxlen) {
+        debug_print("%s", "Buffer full\n");
+        buf->error = MOBI_BUFFER_END;
+        return;
+    }
+    unsigned char *buftr = buf->data + buf->offset;
+    *buftr++ = (uint8_t)((uint32_t)(data & 0xff000000U) >> 24);
+    *buftr++ = (uint8_t)((uint32_t)(data & 0xff0000U) >> 16);
+    *buftr++ = (uint8_t)((uint32_t)(data & 0xff00U) >> 8);
+    *buftr = (uint8_t)((uint32_t)(data & 0xffU));
+    buf->offset += 4;
+}
+
+/**
+ @brief Adds raw data to MOBIBuffer
+ 
+ @param[in,out] buf MOBIBuffer structure to be filled with data
+ @param[in] data Pointer to read data
+ @param[in] len Size of the read data
+ */
+void mobi_buffer_addraw(MOBIBuffer *buf, const unsigned char* data, const size_t len) {
+    if (buf->offset + len > buf->maxlen) {
+        debug_print("%s", "Buffer full\n");
+        buf->error = MOBI_BUFFER_END;
+        return;
+    }
+    memcpy(buf->data + buf->offset, data, len);
+    buf->offset += len;
+}
+
+/**
+ @brief Adds string to MOBIBuffer without null terminator
+ 
+ @param[in,out] buf MOBIBuffer structure to be filled with data
+ @param[in] str Pointer to string
+ */
+void mobi_buffer_addstring(MOBIBuffer *buf, const char *str) {
+    const size_t len = strlen(str);
+    mobi_buffer_addraw(buf, (const unsigned char *) str, len);
+}
+
+/**
+ @brief Adds count of zeroes to MOBIBuffer
+ 
+ @param[in,out] buf MOBIBuffer structure to be filled with data
+ @param[in] count Number of zeroes to be put into the buffer
+ */
+void mobi_buffer_addzeros(MOBIBuffer *buf, const size_t count) {
+    if (buf->offset + count > buf->maxlen) {
+        debug_print("%s", "Buffer full\n");
+        buf->error = MOBI_BUFFER_END;
+        return;
+    }
+    memset(buf->data + buf->offset, 0, count);
+    buf->offset += count;
+}
+
+/**
+ @brief Reads 8-bit value from MOBIBuffer
+ 
+ @param[in] buf MOBIBuffer structure containing data
+ @return Read value, 0 if end of buffer is encountered
+ */
+uint8_t mobi_buffer_get8(MOBIBuffer *buf) {
+    if (buf->offset + 1 > buf->maxlen) {
+        debug_print("%s", "End of buffer\n");
+        buf->error = MOBI_BUFFER_END;
+        return 0;
+    }
+    return buf->data[buf->offset++];
+}
+
+/**
+ @brief Reads 16-bit value from MOBIBuffer
+ 
+ @param[in] buf MOBIBuffer structure containing data
+ @return Read value, 0 if end of buffer is encountered
+ */
+uint16_t mobi_buffer_get16(MOBIBuffer *buf) {
+    if (buf->offset + 2 > buf->maxlen) {
+        debug_print("%s", "End of buffer\n");
+        buf->error = MOBI_BUFFER_END;
+        return 0;
+    }
+    uint16_t val;
+    val = (uint16_t)((uint16_t) buf->data[buf->offset] << 8 | (uint16_t) buf->data[buf->offset + 1]);
+    buf->offset += 2;
+    return val;
+}
+
+/**
+ @brief Reads 32-bit value from MOBIBuffer
+ 
+ @param[in] buf MOBIBuffer structure containing data
+ @return Read value, 0 if end of buffer is encountered
+ */
+uint32_t mobi_buffer_get32(MOBIBuffer *buf) {
+    if (buf->offset + 4 > buf->maxlen) {
+        debug_print("%s", "End of buffer\n");
+        buf->error = MOBI_BUFFER_END;
+        return 0;
+    }
+    uint32_t val;
+    val = (uint32_t) buf->data[buf->offset] << 24 | (uint32_t) buf->data[buf->offset + 1] << 16 | (uint32_t) buf->data[buf->offset + 2] << 8 | (uint32_t) buf->data[buf->offset + 3];
+    buf->offset += 4;
+    return val;
+}
+
+/**
+ @brief Reads variable length value from MOBIBuffer
+ 
+ Internal function for wrappers: 
+ mobi_buffer_get_varlen();
+ mobi_buffer_get_varlen_dec();
+ 
+ Reads maximum 4 bytes from the buffer. Stops when byte has bit 7 set.
+ 
+ This function has a limitation while reading backwards.
+ In such case it will not read first byte in a buffer, as it would cause buffer offset to underflow.
+ That means that going bacwards it cannot read variable length values that are placed at the beginning of a buffer.
+ This will result in an error.
+ 
+ @param[in] buf MOBIBuffer structure containing data
+ @param[out] len Value will be increased by number of bytes read
+ @param[in] direction 1 - read buffer forward, -1 - read buffer backwards
+ @return Read value, 0 if end of buffer is encountered
+ */
+static uint32_t mobi_buffer_get_varlen_internal(MOBIBuffer *buf, size_t *len, const int direction) {
+    bool has_stop = false;
+    uint32_t val = 0;
+    uint8_t byte_count = 0;
+    size_t max_count = direction == 1 ? buf->maxlen - buf->offset : buf->offset;
+    if (buf->offset < buf->maxlen && max_count) {
+        max_count = max_count < 4 ? max_count : 4;
+        uint8_t byte;
+        const uint8_t stop_flag = 0x80;
+        const uint8_t mask = 0x7f;
+        uint32_t shift = 0;
+        unsigned char *p = buf->data + buf->offset;
+        do {
+            if (direction == 1) {
+                byte = *p++;
+                val <<= 7;
+                val |= (byte & mask);
+            } else {
+                byte = *p--;
+                val = val | (uint32_t)(byte & mask) << shift;
+                shift += 7;
+            }
+            byte_count++;
+            has_stop = byte & stop_flag;
+        } while (!has_stop && (byte_count < max_count));
+    }
+    if (!has_stop) {
+        debug_print("%s", "End of buffer\n");
+        buf->error = MOBI_BUFFER_END;
+        return 0;
+    }
+    *len += byte_count;
+    buf->offset = direction == 1 ? buf->offset + byte_count : buf->offset - byte_count;
+    return val;
+}
+
+/**
+ @brief Reads variable length value from MOBIBuffer
+ 
+ Reads maximum 4 bytes from the buffer. Stops when byte has bit 7 set.
+ 
+ @param[in] buf MOBIBuffer structure containing data
+ @param[out] len Value will be increased by number of bytes read
+ @return Read value, 0 if end of buffer is encountered
+ */
+uint32_t mobi_buffer_get_varlen(MOBIBuffer *buf, size_t *len) {
+    return mobi_buffer_get_varlen_internal(buf, len, 1);
+}
+
+/**
+ @brief Reads variable length value from MOBIBuffer going backwards
+ 
+ Reads maximum 4 bytes from the buffer. Stops when byte has bit 7 set.
+ 
+ This function has a limitation. It will not read first byte in a buffer, as it would cause buffer offset to underflow.
+ That means that it cannot read variable length values that are placed at the beginning of a buffer.
+ This will result in an error.
+ 
+ @param[in] buf MOBIBuffer structure containing data
+ @param[out] len Value will be increased by number of bytes read
+ @return Read value, 0 if end of buffer is encountered
+ */
+uint32_t mobi_buffer_get_varlen_dec(MOBIBuffer *buf, size_t *len) {
+    return mobi_buffer_get_varlen_internal(buf, len, -1);
+}
+
+/**
+ @brief Reads raw data from MOBIBuffer and pads it with zero character
+ 
+ @param[out] str Destination for string read from buffer. Length must be (len + 1)
+ @param[in] buf MOBIBuffer structure containing data
+ @param[in] len Length of the data to be read from buffer
+ */
+void mobi_buffer_getstring(char *str, MOBIBuffer *buf, const size_t len) {
+    if (!str) {
+        buf->error = MOBI_PARAM_ERR;
+        return;
+    }
+    if (buf->offset + len > buf->maxlen) {
+        debug_print("%s", "End of buffer\n");
+        buf->error = MOBI_BUFFER_END;
+        str[0] = '\0';
+        return;
+    }
+    memcpy(str, buf->data + buf->offset, len);
+    str[len] = '\0';
+    buf->offset += len;
+}
+
+/**
+ @brief Reads raw data from MOBIBuffer, appends it to a string and pads it with zero character
+ 
+ @param[in,out] str A string to which data will be appended
+ @param[in] buf MOBIBuffer structure containing data
+ @param[in] len Length of the data to be read from buffer
+ */
+void mobi_buffer_appendstring(char *str, MOBIBuffer *buf, const size_t len) {
+    if (!str) {
+        buf->error = MOBI_PARAM_ERR;
+        return;
+    }
+    if (buf->offset + len > buf->maxlen) {
+        debug_print("%s", "End of buffer\n");
+        buf->error = MOBI_BUFFER_END;
+        return;
+    }
+    size_t str_len = strlen(str);
+    memcpy(str + str_len, buf->data + buf->offset, len);
+    str[str_len + len] = '\0';
+    buf->offset += len;
+}
+
+/**
+ @brief Reads raw data from MOBIBuffer
+ 
+ @param[out] data Destination to which data will be appended
+ @param[in] buf MOBIBuffer structure containing data
+ @param[in] len Length of the data to be read from buffer
+ */
+void mobi_buffer_getraw(void *data, MOBIBuffer *buf, const size_t len) {
+    if (!data) {
+        buf->error = MOBI_PARAM_ERR;
+        return;
+    }
+    if (buf->offset + len > buf->maxlen) {
+        debug_print("%s", "End of buffer\n");
+        buf->error = MOBI_BUFFER_END;
+        return;
+    }
+    memcpy(data, buf->data + buf->offset, len);
+    buf->offset += len;
+}
+
+/**
+ @brief Get pointer to MOBIBuffer data at offset
+ 
+ @param[in] buf MOBIBuffer structure containing data
+ @param[in] len Check if requested length is available in buffer
+ @return Pointer to offset, or NULL on failure
+ */
+unsigned char * mobi_buffer_getpointer(MOBIBuffer *buf, const size_t len) {
+    if (buf->offset + len > buf->maxlen) {
+        debug_print("%s", "End of buffer\n");
+        buf->error = MOBI_BUFFER_END;
+        return NULL;
+    }
+    buf->offset += len;
+    return buf->data + buf->offset - len;
+}
+
+/**
+ @brief Read 8-bit value from MOBIBuffer into allocated memory
+ 
+ Read 8-bit value from buffer into memory allocated by the function.
+ Returns pointer to the value, which must be freed later.
+ If the data is not accessible function will return null pointer.
+ 
+ @param[out] val Pointer to value or null pointer on failure
+ @param[in] buf MOBIBuffer structure containing data
+ */
+void mobi_buffer_dup8(uint8_t **val, MOBIBuffer *buf) {
+    *val = NULL;
+    if (buf->offset + 1 > buf->maxlen) {
+        return;
+    }
+    *val = malloc(sizeof(uint8_t));
+    if (*val == NULL) {
+        return;
+    }
+    **val = mobi_buffer_get8(buf);
+}
+
+/**
+ @brief Read 16-bit value from MOBIBuffer into allocated memory
+ 
+ Read 16-bit value from buffer into allocated memory.
+ Returns pointer to the value, which must be freed later.
+ If the data is not accessible function will return null pointer.
+ 
+ @param[out] val Pointer to value or null pointer on failure
+ @param[in] buf MOBIBuffer structure containing data
+ */
+void mobi_buffer_dup16(uint16_t **val, MOBIBuffer *buf) {
+    *val = NULL;
+    if (buf->offset + 2 > buf->maxlen) {
+        return;
+    }
+    *val = malloc(sizeof(uint16_t));
+    if (*val == NULL) {
+        return;
+    }
+    **val = mobi_buffer_get16(buf);
+}
+
+/**
+ @brief Read 32-bit value from MOBIBuffer into allocated memory
+ 
+ Read 32-bit value from buffer into allocated memory.
+ Returns pointer to the value, which must be freed later.
+ If the data is not accessible function will return null pointer.
+ 
+ @param[out] val Pointer to value
+ @param[in] buf MOBIBuffer structure containing data
+ */
+void mobi_buffer_dup32(uint32_t **val, MOBIBuffer *buf) {
+    *val = NULL;
+    if (buf->offset + 4 > buf->maxlen) {
+        return;
+    }
+    *val = malloc(sizeof(uint32_t));
+    if (*val == NULL) {
+        return;
+    }
+    **val = mobi_buffer_get32(buf);
+}
+
+/**
+ @brief Copy 8-bit value from one MOBIBuffer into another
+ 
+ @param[out] dest Destination buffer
+ @param[in] source Source buffer
+ */
+void mobi_buffer_copy8(MOBIBuffer *dest, MOBIBuffer *source) {
+    mobi_buffer_add8(dest, mobi_buffer_get8(source));
+}
+
+/**
+ @brief Copy raw value from one MOBIBuffer into another
+ 
+ @param[out] dest Destination buffer
+ @param[in] source Source buffer
+ @param[in] len Number of bytes to copy
+ */
+void mobi_buffer_copy(MOBIBuffer *dest, MOBIBuffer *source, const size_t len) {
+    if (source->offset + len > source->maxlen) {
+        debug_print("%s", "End of buffer\n");
+        source->error = MOBI_BUFFER_END;
+        return;
+    }
+    if (dest->offset + len > dest->maxlen) {
+        debug_print("%s", "End of buffer\n");
+        dest->error = MOBI_BUFFER_END;
+        return;
+    }
+    memcpy(dest->data + dest->offset, source->data + source->offset, len);
+    dest->offset += len;
+    source->offset += len;
+}
+
+/**
+ @brief Copy raw value within one MOBIBuffer
+ 
+ Memmove len bytes from offset (relative to current position)
+ to current position in buffer and advance buffer position.
+ Data may overlap.
+ 
+ @param[out] buf Buffer
+ @param[in] offset Offset to read from
+ @param[in] len Number of bytes to copy
+ */
+void mobi_buffer_move(MOBIBuffer *buf, const int offset, const size_t len) {
+    size_t aoffset = (size_t) abs(offset);
+    unsigned char *source = buf->data + buf->offset;
+    if (offset >= 0) {
+        if (buf->offset + aoffset + len > buf->maxlen) {
+            debug_print("%s", "End of buffer\n");
+            buf->error = MOBI_BUFFER_END;
+            return;
+        }
+        source += aoffset;
+    } else {
+        if ( (buf->offset < aoffset) || (buf->offset + len > buf->maxlen) ) {
+            debug_print("%s", "Beyond start/end of buffer\n");
+            buf->error = MOBI_BUFFER_END;
+            return;
+        }
+        source -= aoffset;
+    }
+    memmove(buf->data + buf->offset, source, len);
+    buf->offset += len;
+}
+
+/**
+ @brief Check if buffer data header contains magic signature
+ 
+ @param[in] buf MOBIBuffer buffer containing data
+ @param[in] magic Magic signature
+ @return boolean true on match, false otherwise
+ */
+bool mobi_buffer_match_magic(MOBIBuffer *buf, const char *magic) {
+    const size_t magic_length = strlen(magic);
+    if (buf->offset + magic_length > buf->maxlen) {
+        return false;
+    }
+    if (memcmp(buf->data + buf->offset, magic, magic_length) == 0) {
+        return true;
+    }
+    return false;
+}
+
+/**
+ @brief Check if buffer contains magic signature at given offset
+ 
+ @param[in] buf MOBIBuffer buffer containing data
+ @param[in] magic Magic signature
+ @param[in] offset Offset
+ @return boolean true on match, false otherwise
+ */
+bool mobi_buffer_match_magic_offset(MOBIBuffer *buf, const char *magic, const size_t offset) {
+    bool match = false;
+    if (offset <= buf->maxlen) {
+        const size_t save_offset = buf->offset;
+        buf->offset = offset;
+        match = mobi_buffer_match_magic(buf, magic);
+        buf->offset = save_offset;
+    }
+    return match;
+}
+
+/**
+ @brief Move current buffer offset by diff bytes
+ 
+ @param[in,out] buf MOBIBuffer buffer containing data
+ @param[in] diff Number of bytes by which the offset is adjusted
+ */
+void mobi_buffer_seek(MOBIBuffer *buf, const int diff) {
+    size_t adiff = (size_t) abs(diff);
+    if (diff >= 0) {
+        if (buf->offset + adiff <= buf->maxlen) {
+            buf->offset += adiff;
+            return;
+        }
+    } else {
+        if (buf->offset >= adiff) {
+            buf->offset -= adiff;
+            return;
+        }
+    }
+    buf->error = MOBI_BUFFER_END;
+    debug_print("%s", "End of buffer\n");
+}
+
+/**
+ @brief Set buffer offset to pos position
+ 
+ @param[in,out] buf MOBIBuffer buffer containing data
+ @param[in] pos New position
+ */
+void mobi_buffer_setpos(MOBIBuffer *buf, const size_t pos) {
+    if (pos <= buf->maxlen) {
+        buf->offset = pos;
+        return;
+    }
+    buf->error = MOBI_BUFFER_END;
+    debug_print("%s", "End of buffer\n");
+}
+
+/**
+ @brief Free pointer to MOBIBuffer structure and pointer to data
+ 
+ Free data initialized with mobi_buffer_init();
+ 
+ @param[in] buf MOBIBuffer structure
+ */
+void mobi_buffer_free(MOBIBuffer *buf) {
+    if (buf == NULL) { return; }
+    if (buf->data != NULL) {
+        free(buf->data);
+    }
+    free(buf);
+}
+
+/**
+ @brief Free pointer to MOBIBuffer structure
+ 
+ Free data initialized with mobi_buffer_init_null();
+ Unlike mobi_buffer_free() it will not free pointer to buf->data
+ 
+ @param[in] buf MOBIBuffer structure
+ */
+void mobi_buffer_free_null(MOBIBuffer *buf) {
+    if (buf == NULL) { return; }
+    free(buf);
+}

app/src/main/cpp/libmobi/src/buffer.h

@@ -0,0 +1,58 @@
+/** @file buffer.h
+ *
+ * Copyright (c) 2014 Bartek Fabiszewski
+ * http://www.fabiszewski.net
+ *
+ * This file is part of libmobi.
+ * Licensed under LGPL, either version 3, or any later.
+ * See <http://www.gnu.org/licenses/>
+ */
+
+#ifndef libmobi_buffer_h
+#define libmobi_buffer_h
+
+#include "config.h"
+#include "mobi.h"
+
+/**
+ @brief Buffer to read to/write from
+ */
+typedef struct {
+    size_t offset; /**< Current offset in respect to buffer start */
+    size_t maxlen; /**< Length of the buffer data */
+    unsigned char *data; /**< Pointer to buffer data */
+    MOBI_RET error; /**< MOBI_SUCCESS = 0 if operation on buffer is successful, non-zero value on failure */
+} MOBIBuffer;
+
+MOBIBuffer * mobi_buffer_init(const size_t len);
+MOBIBuffer * mobi_buffer_init_null(unsigned char *data, const size_t len);
+void mobi_buffer_resize(MOBIBuffer *buf, const size_t newlen);
+void mobi_buffer_add8(MOBIBuffer *buf, const uint8_t data);
+void mobi_buffer_add16(MOBIBuffer *buf, const uint16_t data);
+void mobi_buffer_add32(MOBIBuffer *buf, const uint32_t data);
+void mobi_buffer_addraw(MOBIBuffer *buf, const unsigned char* data, const size_t len);
+void mobi_buffer_addstring(MOBIBuffer *buf, const char *str);
+void mobi_buffer_addzeros(MOBIBuffer *buf, const size_t count);
+uint8_t mobi_buffer_get8(MOBIBuffer *buf);
+uint16_t mobi_buffer_get16(MOBIBuffer *buf);
+uint32_t mobi_buffer_get32(MOBIBuffer *buf);
+uint32_t mobi_buffer_get_varlen(MOBIBuffer *buf, size_t *len);
+uint32_t mobi_buffer_get_varlen_dec(MOBIBuffer *buf, size_t *len);
+void mobi_buffer_dup8(uint8_t **val, MOBIBuffer *buf);
+void mobi_buffer_dup16(uint16_t **val, MOBIBuffer *buf);
+void mobi_buffer_dup32(uint32_t **val, MOBIBuffer *buf);
+void mobi_buffer_getstring(char *str, MOBIBuffer *buf, const size_t len);
+void mobi_buffer_appendstring(char *str, MOBIBuffer *buf, const size_t len);
+void mobi_buffer_getraw(void *data, MOBIBuffer *buf, const size_t len);
+unsigned char * mobi_buffer_getpointer(MOBIBuffer *buf, const size_t len);
+void mobi_buffer_copy8(MOBIBuffer *dest, MOBIBuffer *source);
+void mobi_buffer_move(MOBIBuffer *buf, const int offset, const size_t len);
+void mobi_buffer_copy(MOBIBuffer *dest, MOBIBuffer *source, const size_t len);
+bool mobi_buffer_match_magic(MOBIBuffer *buf, const char *magic);
+bool mobi_buffer_match_magic_offset(MOBIBuffer *buf, const char *magic, const size_t offset);
+void mobi_buffer_seek(MOBIBuffer *buf, const int diff);
+void mobi_buffer_setpos(MOBIBuffer *buf, const size_t pos);
+void mobi_buffer_free(MOBIBuffer *buf);
+void mobi_buffer_free_null(MOBIBuffer *buf);
+
+#endif

app/src/main/cpp/libmobi/src/compression.c

@@ -0,0 +1,221 @@
+/** @file compression.c
+ *  @brief Functions handling compression
+ *
+ * Copyright (c) 2014 Bartek Fabiszewski
+ * http://www.fabiszewski.net
+ *
+ * This file is part of libmobi.
+ * Licensed under LGPL, either version 3, or any later.
+ * See <http://www.gnu.org/licenses/>
+ */
+
+#include <string.h>
+#include "compression.h"
+#include "buffer.h"
+#include "mobi.h"
+#include "debug.h"
+
+
+/** 
+ @brief Decompressor fo PalmDOC version of LZ77 compression
+
+ Decompressor based on this algorithm:
+ http://en.wikibooks.org/wiki/Data_Compression/Dictionary_compression#PalmDoc
+
+ @param[out] out Decompressed destination data
+ @param[in] in Compressed source data
+ @param[in,out] len_out Size of the memory reserved for decompressed data.
+ On return it is set to actual size of decompressed data
+ @param[in] len_in Size of compressed data
+ @return MOBI_RET status code (on success MOBI_SUCCESS)
+ */
+MOBI_RET mobi_decompress_lz77(unsigned char *out, const unsigned char *in, size_t *len_out, const size_t len_in) {
+    MOBI_RET ret = MOBI_SUCCESS;
+    MOBIBuffer *buf_in = mobi_buffer_init_null((unsigned char *) in, len_in);
+    if (buf_in == NULL) {
+        debug_print("%s\n", "Memory allocation failed");
+        return MOBI_MALLOC_FAILED;
+    }
+    MOBIBuffer *buf_out = mobi_buffer_init_null(out, *len_out);
+    if (buf_out == NULL) {
+        mobi_buffer_free_null(buf_in);
+        debug_print("%s\n", "Memory allocation failed");
+        return MOBI_MALLOC_FAILED;
+    }
+    while (ret == MOBI_SUCCESS && buf_in->offset < buf_in->maxlen) {
+        uint8_t byte = mobi_buffer_get8(buf_in);
+        /* byte pair: space + char */
+        if (byte >= 0xc0) {
+            mobi_buffer_add8(buf_out, ' ');
+            mobi_buffer_add8(buf_out, byte ^ 0x80);
+        }
+        /* length, distance pair */
+        /* 0x8000 + (distance << 3) + ((length-3) & 0x07) */
+        else if (byte >= 0x80) {
+            uint8_t next = mobi_buffer_get8(buf_in);
+            uint16_t distance = ((((byte << 8) | ((uint8_t)next)) >> 3) & 0x7ff);
+            uint8_t length = (next & 0x7) + 3;
+            while (length--) {
+                mobi_buffer_move(buf_out, -distance, 1);
+            }
+        }
+        /* single char, not modified */
+        else if (byte >= 0x09) {
+            mobi_buffer_add8(buf_out, byte);
+        }
+        /* val chars not modified */
+        else if (byte >= 0x01) {
+            mobi_buffer_copy(buf_out, buf_in, byte);
+        }
+        /* char '\0', not modified */
+        else {
+            mobi_buffer_add8(buf_out, byte);
+        }
+        if (buf_in->error || buf_out->error) {
+            ret = MOBI_BUFFER_END;
+        }
+    }
+    *len_out = buf_out->offset;
+    mobi_buffer_free_null(buf_out);
+    mobi_buffer_free_null(buf_in);
+    return ret;
+}
+
+/**
+ @brief Read at most 8 bytes from buffer, big-endian
+ 
+ If buffer data is shorter returned value is padded with zeroes
+ 
+ @param[in] buf MOBIBuffer structure to read from
+ @return 64-bit value
+ */
+static MOBI_INLINE uint64_t mobi_buffer_fill64(MOBIBuffer *buf) {
+    uint64_t val = 0;
+    uint8_t i = 8;
+    size_t bytesleft = buf->maxlen - buf->offset;
+    unsigned char *ptr = buf->data + buf->offset;
+    while (i-- && bytesleft--) {
+        val |= (uint64_t) *ptr++ << (i * 8);
+    }
+    /* increase counter by 4 bytes only, 4 bytes overlap on each call */
+    buf->offset += 4;
+    return val;
+}
+
+/**
+ @brief Internal function for huff/cdic decompression
+ 
+ Decompressor and HUFF/CDIC records parsing based on:
+ perl EBook::Tools::Mobipocket
+ python mobiunpack.py, calibre
+ 
+ @param[out] buf_out MOBIBuffer structure with decompressed data
+ @param[in] buf_in MOBIBuffer structure with compressed data
+ @param[in] huffcdic MOBIHuffCdic structure with parsed data from huff/cdic records
+ @param[in] depth Depth of current recursion level
+ @return MOBI_RET status code (on success MOBI_SUCCESS)
+ */
+static MOBI_RET mobi_decompress_huffman_internal(MOBIBuffer *buf_out, MOBIBuffer *buf_in, const MOBIHuffCdic *huffcdic, size_t depth) {
+    if (depth > MOBI_HUFFMAN_MAXDEPTH) {
+        debug_print("Too many levels of recursion: %zu\n", depth);
+        return MOBI_DATA_CORRUPT;
+    }
+    MOBI_RET ret = MOBI_SUCCESS;
+    int8_t bitcount = 32;
+    /* this cast should be safe: max record size is 4096 */
+    int bitsleft = (int) (buf_in->maxlen * 8);
+    uint8_t code_length = 0;
+    uint64_t buffer = mobi_buffer_fill64(buf_in);
+    while (ret == MOBI_SUCCESS) {
+        if (bitcount <= 0) {
+            bitcount += 32;
+            buffer = mobi_buffer_fill64(buf_in);
+        }
+        uint32_t code = (buffer >> bitcount) & 0xffffffffU;
+        /* lookup code in table1 */
+        uint32_t t1 = huffcdic->table1[code >> 24];
+        /* get maxcode and codelen from t1 */
+        code_length = t1 & 0x1f;
+        uint32_t maxcode = (((t1 >> 8) + 1) << (32 - code_length)) - 1;
+        /* check termination bit */
+        if (!(t1 & 0x80)) {
+            /* get offset from mincode, maxcode tables */
+            while (code < huffcdic->mincode_table[code_length]) {
+                if (++code_length >= HUFF_CODETABLE_SIZE) {
+                    debug_print("Wrong offset to mincode table: %hhu\n", code_length);
+                    return MOBI_DATA_CORRUPT;
+                }
+            }
+            maxcode = huffcdic->maxcode_table[code_length];
+        }
+        bitcount -= code_length;
+        bitsleft -= code_length;
+        if (bitsleft < 0) {
+            break;
+        }
+        /* get index for symbol offset */
+        uint32_t index = (uint32_t) (maxcode - code) >> (32 - code_length);
+        /* check which part of cdic to use */
+        uint16_t cdic_index = (uint16_t) ((uint32_t)index >> huffcdic->code_length);
+        if (index >= huffcdic->index_count) {
+            debug_print("Wrong symbol offsets index: %u\n", index);
+            return MOBI_DATA_CORRUPT;
+        }
+        /* get offset */
+        uint32_t offset = huffcdic->symbol_offsets[index];
+        uint32_t symbol_length = (uint32_t) huffcdic->symbols[cdic_index][offset] << 8 | (uint32_t) huffcdic->symbols[cdic_index][offset + 1];
+        /* 1st bit is is_decompressed flag */
+        int is_decompressed = symbol_length >> 15;
+        /* get rid of flag */
+        symbol_length &= 0x7fff;
+        if (is_decompressed) {
+            /* symbol is at (offset + 2), 2 bytes used earlier for symbol length */
+            mobi_buffer_addraw(buf_out, (huffcdic->symbols[cdic_index] + offset + 2), symbol_length);
+            ret = buf_out->error;
+        } else {
+            /* symbol is compressed */
+            /* TODO cache uncompressed symbols? */
+            MOBIBuffer buf_sym;
+            buf_sym.data = huffcdic->symbols[cdic_index] + offset + 2;
+            buf_sym.offset = 0;
+            buf_sym.maxlen = symbol_length;
+            buf_sym.error = MOBI_SUCCESS;
+            ret = mobi_decompress_huffman_internal(buf_out, &buf_sym, huffcdic, depth + 1);
+        }
+    }
+    return ret;
+}
+
+/**
+ @brief Decompressor for huff/cdic compressed text records
+ 
+ Decompressor and HUFF/CDIC records parsing based on:
+ perl EBook::Tools::Mobipocket
+ python mobiunpack.py, calibre
+ 
+ @param[out] out Decompressed destination data
+ @param[in] in Compressed source data
+ @param[in,out] len_out Size of the memory reserved for decompressed data.
+ On return it is set to actual size of decompressed data
+ @param[in] len_in Size of compressed data
+ @param[in] huffcdic MOBIHuffCdic structure with parsed data from huff/cdic records
+ @return MOBI_RET status code (on success MOBI_SUCCESS)
+ */
+MOBI_RET mobi_decompress_huffman(unsigned char *out, const unsigned char *in, size_t *len_out, size_t len_in, const MOBIHuffCdic *huffcdic) {
+    MOBIBuffer *buf_in = mobi_buffer_init_null((unsigned char *) in, len_in);
+    if (buf_in == NULL) {
+        debug_print("%s\n", "Memory allocation failed");
+        return MOBI_MALLOC_FAILED;
+    }
+    MOBIBuffer *buf_out = mobi_buffer_init_null(out, *len_out);
+    if (buf_out == NULL) {
+        mobi_buffer_free_null(buf_in);
+        debug_print("%s\n", "Memory allocation failed");
+        return MOBI_MALLOC_FAILED;
+    }
+    MOBI_RET ret = mobi_decompress_huffman_internal(buf_out, buf_in, huffcdic, 0);
+    *len_out = buf_out->offset;
+    mobi_buffer_free_null(buf_out);
+    mobi_buffer_free_null(buf_in);
+    return ret;
+}

app/src/main/cpp/libmobi/src/compression.h

@@ -0,0 +1,43 @@
+/** @file compression.h
+ *
+ * Copyright (c) 2014 Bartek Fabiszewski
+ * http://www.fabiszewski.net
+ *
+ * This file is part of libmobi.
+ * Licensed under LGPL, either version 3, or any later.
+ * See <http://www.gnu.org/licenses/>
+ */
+
+#ifndef libmobi_compression_h
+#define libmobi_compression_h
+
+#include "config.h"
+#include "mobi.h"
+
+#ifndef MOBI_INLINE
+#define MOBI_INLINE /**< Syntax for compiler inline keyword from config.h */
+#endif
+
+/* FIXME: what is the reasonable value? */
+#define MOBI_HUFFMAN_MAXDEPTH 20 /**< Maximal recursion level for huffman decompression routine */
+#define HUFF_CODETABLE_SIZE 33 /**< Size of min- and maxcode tables */
+
+
+/**
+ @brief Parsed data from HUFF and CDIC records needed to unpack huffman compressed text
+ */
+typedef struct {
+    size_t index_count; /**< Total number of indices in all CDIC records, stored in each CDIC record header */
+    size_t index_read; /**< Number of indices parsed, used by parser */
+    size_t code_length; /**< Code length value stored in CDIC record header */
+    uint32_t table1[256]; /**< Table of big-endian indices from HUFF record data1 */
+    uint32_t mincode_table[HUFF_CODETABLE_SIZE]; /**< Table of big-endian mincodes from HUFF record data2 */
+    uint32_t maxcode_table[HUFF_CODETABLE_SIZE]; /**< Table of big-endian maxcodes from HUFF record data2 */
+    uint16_t *symbol_offsets; /**< Index of symbol offsets parsed from CDIC records (index_count entries) */
+    unsigned char **symbols; /**< Array of pointers to start of symbols data in each CDIC record (index = number of CDIC record) */
+} MOBIHuffCdic;
+
+MOBI_RET mobi_decompress_lz77(unsigned char *out, const unsigned char *in, size_t *len_out, const size_t len_in);
+MOBI_RET mobi_decompress_huffman(unsigned char *out, const unsigned char *in, size_t *len_out, size_t len_in, const MOBIHuffCdic *huffcdic);
+
+#endif

app/src/main/cpp/libmobi/src/config.h

@@ -0,0 +1,18 @@
+/** @file src/config.h
+ *
+ * Copyright (c) 2014 Bartek Fabiszewski
+ * http://www.fabiszewski.net
+ *
+ * This file is part of libmobi.
+ * Licensed under LGPL, either version 3, or any later.
+ * See <http://www.gnu.org/licenses/>
+ */
+
+#ifndef mobi_config_h
+#define mobi_config_h
+
+#ifdef HAVE_CONFIG_H
+#include "../config.h"
+#endif
+
+#endif

app/src/main/cpp/libmobi/src/debug.c

@@ -0,0 +1,159 @@
+/** @file debug.c
+ *  @brief Debugging functions, enable by running configure --enable-debug
+ *
+ * Copyright (c) 2014 Bartek Fabiszewski
+ * http://www.fabiszewski.net
+ *
+ * This file is part of libmobi.
+ * Licensed under LGPL, either version 3, or any later.
+ * See <http://www.gnu.org/licenses/>
+ */
+
+#include <stdlib.h>
+
+#include "debug.h"
+#include "index.h"
+
+/**
+ @brief Debugging wrapper for free(void *ptr)
+ 
+ @param[in] ptr Pointer
+ @param[in] file Calling file
+ @param[in] line Calling line
+ */
+void debug_free(void *ptr, const char *file, const int line) {
+    printf("%s:%d: free(%p)\n",file, line, ptr);
+    (free)(ptr);
+}
+
+/**
+ @brief Debugging wrapper for malloc(size_t size)
+ 
+ @param[in] size Size of memory
+ @param[in] file Calling file
+ @param[in] line Calling line
+ @return A pointer to the allocated memory block on success, NULL on failure
+
+ */
+void *debug_malloc(const size_t size, const char *file, const int line) {
+    void *ptr = (malloc)(size);
+    printf("%s:%d: malloc(%d)=%p\n", file, line, (int)size, ptr);
+    return ptr;
+}
+
+/**
+ @brief Debugging wrapper for realloc(void* ptr, size_t size)
+ 
+ @param[in] ptr Pointer
+ @param[in] size Size of memory
+ @param[in] file Calling file
+ @param[in] line Calling line
+ @return A pointer to the reallocated memory block on success, NULL on failure
+ */
+void *debug_realloc(void *ptr, const size_t size, const char *file, const int line) {
+    printf("%s:%d: realloc(%p", file, line, ptr);
+    void *rptr = (realloc)(ptr, size);
+    printf(", %d)=%p\n", (int)size, rptr);
+    return rptr;
+}
+
+/**
+ @brief Debugging wrapper for calloc(size_t num, size_t size)
+ 
+ @param[in] num Number of elements to allocate
+ @param[in] size Size of each element
+ @param[in] file Calling file
+ @param[in] line Calling line
+ @return A pointer to the allocated memory block on success, NULL on failure
+ */
+void *debug_calloc(const size_t num, const size_t size, const char *file, const int line) {
+    void *ptr = (calloc)(num, size);
+    printf("%s:%d: calloc(%d, %d)=%p\n", file, line, (int)num, (int)size, ptr);
+    return ptr;
+}
+
+/**
+ @brief Dump index values
+ 
+ @param[in] indx Parsed index
+*/
+void print_indx(const MOBIIndx *indx) {
+    if (indx == NULL) { return; }
+    for (size_t i = 0; i < indx->entries_count; i++) {
+        MOBIIndexEntry e = indx->entries[i];
+        printf("entry[%zu]: \"%s\"\n", i, e.label);
+        for (size_t j = 0; j < e.tags_count; j++) {
+            MOBIIndexTag t = e.tags[j];
+            printf("  tag[%zu] ", t.tagid);
+            for (size_t k = 0; k < t.tagvalues_count; k++) {
+                printf("[%u] ", t.tagvalues[k]);
+            }
+            printf("\n");
+        }
+    }
+}
+
+/**
+ @brief Dump inflections index (old version)
+ 
+ @param[in] indx Parsed index
+*/
+void print_indx_infl_old(const MOBIIndx *indx) {
+    if (indx == NULL) { return; }
+    for (size_t i = 0; i < indx->entries_count; i++) {
+        MOBIIndexEntry e = indx->entries[i];
+        printf("entry[%zu]: \"%s\"\n", i, e.label);
+        for (size_t j = 0; j < e.tags_count; j++) {
+            MOBIIndexTag t = e.tags[j];
+            printf("  tag[%zu] ", t.tagid);
+            if (t.tagid == 7) {
+                for (size_t k = 0; k < t.tagvalues_count; k += 2) {
+                    uint32_t len = t.tagvalues[k];
+                    uint32_t offset = t.tagvalues[k + 1];
+                    char *string = mobi_get_cncx_string_flat(indx->cncx_record, offset, len);
+                    if (string) {
+                        printf("\"%s\" [%u] [%u]", string, len, offset);
+                        free(string);
+                    }
+                }
+            } else {
+                for (size_t k = 0; k < t.tagvalues_count; k++) {
+                    printf("[%u] ", t.tagvalues[k]);
+                }
+            }
+            printf("\n");
+        }
+    }
+}
+
+/**
+ @brief Dump orthographic index (old version)
+ 
+ @param[in] indx Parsed index
+*/
+void print_indx_orth_old(const MOBIIndx *indx) {
+    if (indx == NULL) { return; }
+    for (size_t i = 0; i < indx->entries_count; i++) {
+        MOBIIndexEntry e = indx->entries[i];
+        printf("entry[%zu]: \"%s\"\n", i, e.label);
+        for (size_t j = 0; j < e.tags_count; j++) {
+            MOBIIndexTag t = e.tags[j];
+            printf("  tag[%zu] ", t.tagid);
+            if (t.tagid >= 69) {
+                for (size_t k = 0; k < t.tagvalues_count; k++) {
+                    uint32_t offset = t.tagvalues[k];
+                    char *string = mobi_get_cncx_string(indx->cncx_record, offset);
+                    if (string) {
+                        printf("\"%s\" [%u] ", string, t.tagvalues[k]);
+                        free(string);
+                    }
+                }
+            } else {
+                for (size_t k = 0; k < t.tagvalues_count; k++) {
+                    printf("[%u] ", t.tagvalues[k]);
+                }
+            }
+            printf("\n");
+        }
+    }
+}

app/src/main/cpp/libmobi/src/debug.h

@@ -0,0 +1,57 @@
+/** @file debug.h
+ *
+ * Copyright (c) 2014 Bartek Fabiszewski
+ * http://www.fabiszewski.net
+ *
+ * This file is part of libmobi.
+ * Licensed under LGPL, either version 3, or any later.
+ * See <http://www.gnu.org/licenses/>
+ */
+
+#ifndef libmobi_debug_h
+#define libmobi_debug_h
+
+#include "config.h"
+#include "mobi.h"
+
+#ifndef MOBI_DEBUG
+#define MOBI_DEBUG 0 /**< Turn on debugging, set this on by running "configure --enable-debug" */
+#endif
+
+#if MOBI_DEBUG_ALLOC
+/**
+ @defgroup mobi_debug Debug wrappers for memory allocation functions
+ 
+ Set this on by running "configure --enable-debug-alloc"
+ @{
+ */
+#define free(x) debug_free(x, __FILE__, __LINE__)
+#define malloc(x) debug_malloc(x, __FILE__, __LINE__)
+#define realloc(x, y) debug_realloc(x, y, __FILE__, __LINE__)
+#define calloc(x, y) debug_calloc(x, y, __FILE__, __LINE__)
+/** @} */
+#endif
+
+void debug_free(void *ptr, const char *file, const int line);
+void *debug_malloc(const size_t size, const char *file, const int line);
+void *debug_realloc(void *ptr, const size_t size, const char *file, const int line);
+void *debug_calloc(const size_t num, const size_t size, const char *file, const int line);
+void print_indx(const MOBIIndx *indx);
+void print_indx_infl_old(const MOBIIndx *indx);
+void print_indx_orth_old(const MOBIIndx *indx);
+
+/**
+ @brief Macro for printing debug info to stderr. Wrapper for fprintf
+ @param[in] fmt Format
+ @param[in] ... Additional arguments
+ */
+#if (MOBI_DEBUG)
+#define debug_print(fmt, ...) { \
+    fprintf(stderr, "%s:%d:%s(): " fmt, __FILE__, \
+    __LINE__, __func__, __VA_ARGS__); \
+}
+#else
+#define debug_print(fmt, ...)
+#endif
+
+#endif

app/src/main/cpp/libmobi/src/encryption.h

@@ -0,0 +1,47 @@
+/** @file encryption.h
+ *
+ * Copyright (c) 2014 Bartek Fabiszewski
+ * http://www.fabiszewski.net
+ *
+ * This file is part of libmobi.
+ * Licensed under LGPL, either version 3, or any later.
+ * See <http://www.gnu.org/licenses/>
+ */
+
+#ifndef mobi_encryption_h
+#define mobi_encryption_h
+
+#include "config.h"
+#include "mobi.h"
+#include "buffer.h"
+
+/**
+ @brief Drm cookie data
+ */
+typedef struct {
+    unsigned char *pid; /**< PIDs for decryption, NULL if not set */
+    uint32_t valid_from; /**< validity period start time, unix time in minutes, 0 if not set */
+    uint32_t valid_to; /**< validity period end time, unix time in minutes, MOBI_NOTSET if not set */
+} MOBICookie;
+
+/**
+ @brief Drm data
+ */
+
+typedef struct {
+    unsigned char *key; /**< key for decryption, NULL if not set */
+    uint32_t cookies_count; /**< Cookies count */
+    MOBICookie **cookies; /**< DRM cookie */
+} MOBIDrm;
+
+void mobi_free_drm(MOBIData *m);
+MOBI_RET mobi_buffer_decrypt(unsigned char *out, const unsigned char *in, const size_t length, const MOBIData *m);
+MOBI_RET mobi_drmkey_set(MOBIData *m, const char *pid);
+MOBI_RET mobi_drmkey_set_serial(MOBIData *m, const char *serial);
+MOBI_RET mobi_drmkey_delete(MOBIData *m);
+MOBI_RET mobi_voucher_add(MOBIData *m, const char *serial, const time_t valid_from, const time_t valid_to,
+                          const MOBIExthTag *tamperkeys, const size_t tamperkeys_count);
+MOBI_RET mobi_drm_serialize_v1(MOBIBuffer *buf, const MOBIData *m);
+MOBI_RET mobi_drm_serialize_v2(MOBIBuffer *buf, const MOBIData *m);
+
+#endif /* defined(mobi_encryption_h) */

app/src/main/cpp/libmobi/src/index.h

@@ -0,0 +1,128 @@
+/** @file index.h
+ *
+ * Copyright (c) 2014 Bartek Fabiszewski
+ * http://www.fabiszewski.net
+ *
+ * This file is part of libmobi.
+ * Licensed under LGPL, either version 3, or any later.
+ * See <http://www.gnu.org/licenses/>
+ */
+
+#ifndef mobi_index_h
+#define mobi_index_h
+
+#include "config.h"
+#include "structure.h"
+#include "mobi.h"
+
+/**
+ @defgroup index_tag Predefined tag arrays: {tagid, tagindex} for mobi_get_indxentry_tagvalue()
+ @{
+ */
+#define INDX_TAG_GUIDE_TITLE_CNCX (unsigned[]) {1, 0} /**< Guide title CNCX offset */
+
+#define INDX_TAG_NCX_FILEPOS (unsigned[]) {1, 0} /**< NCX filepos offset */
+#define INDX_TAG_NCX_TEXT_CNCX (unsigned[]) {3, 0} /**< NCX text CNCX offset */
+#define INDX_TAG_NCX_LEVEL (unsigned[]) {4, 0} /**< NCX level */
+#define INDX_TAG_NCX_KIND_CNCX (unsigned[]) {5, 0} /**< NCX kind CNCX offset */
+#define INDX_TAG_NCX_POSFID (unsigned[]) {6, 0} /**< NCX pos:fid */
+#define INDX_TAG_NCX_POSOFF (unsigned[]) {6, 1} /**< NCX pos:off */
+#define INDX_TAG_NCX_PARENT (unsigned[]) {21, 0} /**< NCX parent */
+#define INDX_TAG_NCX_CHILD_START (unsigned[]) {22, 0} /**< NCX start child */
+#define INDX_TAG_NCX_CHILD_END (unsigned[]) {23, 0} /**< NCX last child */
+
+#define INDX_TAG_SKEL_COUNT (unsigned[]) {1, 0} /**< Skel fragments count */
+#define INDX_TAG_SKEL_POSITION (unsigned[]) {6, 0} /**< Skel position */
+#define INDX_TAG_SKEL_LENGTH (unsigned[]) {6, 1} /**< Skel length */
+
+#define INDX_TAG_FRAG_AID_CNCX (unsigned[]) {2, 0} /**< Frag aid CNCX offset */
+#define INDX_TAG_FRAG_FILE_NR (unsigned[]) {3, 0} /**< Frag file number */
+#define INDX_TAG_FRAG_SEQUENCE_NR (unsigned[]) {4, 0} /**< Frag sequence number */
+#define INDX_TAG_FRAG_POSITION (unsigned[]) {6, 0} /**< Frag position */
+#define INDX_TAG_FRAG_LENGTH (unsigned[]) {6, 1} /**< Frag length */
+
+#define INDX_TAG_ORTH_POSITION (unsigned[]) {1, 0} /**< Orth entry start position */
+#define INDX_TAG_ORTH_LENGTH (unsigned[]) {2, 0} /**< Orth entry end position */
+
+#define INDX_TAGARR_ORTH_INFL 42 /**< Inflection groups for orth entry */
+#define INDX_TAGARR_INFL_GROUPS 5 /**< Inflection groups in infl index */
+#define INDX_TAGARR_INFL_PARTS_V2 26 /**< Inflection particles in infl index */
+
+#define INDX_TAGARR_INFL_PARTS_V1 7 /**< Inflection particles in old type infl index */
+/** @} */
+
+#define INDX_LABEL_SIZEMAX 1000 /**< Max size of index label */
+#define INDX_INFLTAG_SIZEMAX 25000 /**< Max size of inflections tags per entry */
+#define INDX_INFLBUF_SIZEMAX 500 /**< Max size of index label */
+#define INDX_INFLSTRINGS_MAX 500 /**< Max number of inflected strings */
+#define ORDT_RECORD_MAXCNT 256 /* max entries count in old ordt */
+#define CNCX_RECORD_MAXCNT 0xf /* max entries count */
+#define INDX_RECORD_MAXCNT 10000 /* max index entries per record */
+#define INDX_TOTAL_MAXCNT ((size_t) INDX_RECORD_MAXCNT * 0xffff) /* max total index entries */
+#define INDX_NAME_SIZEMAX 0xff
+
+/**
+ @brief Maximum value of tag values in index entry (MOBIIndexTag)
+ */
+#define INDX_TAGVALUES_MAX 100
+
+/**
+ @brief Tag entries in TAGX section (for internal INDX parsing)
+ */
+typedef struct {
+    uint8_t tag; /**< Tag */
+    uint8_t values_count; /**< Number of values */
+    uint8_t bitmask; /**< Bitmask */
+    uint8_t control_byte; /**< EOF control byte */
+} TAGXTags;
+
+/**
+ @brief Parsed TAGX section (for internal INDX parsing)
+ 
+ TAGX tags hold metadata of index entries.
+ It is present in the first index record.
+ */
+typedef struct {
+    TAGXTags *tags; /**< Array of tag entries */
+    size_t tags_count; /**< Number of tag entries */
+    size_t control_byte_count; /**< Number of control bytes */
+} MOBITagx;
+
+/**
+ @brief Parsed IDXT section (for internal INDX parsing)
+ 
+ IDXT section holds offsets to index entries
+ */
+typedef struct {
+    uint32_t *offsets; /**< Offsets to index entries */
+    size_t offsets_count; /**< Offsets count */
+} MOBIIdxt;
+
+/**
+ @brief Parsed ORDT sections (for internal INDX parsing)
+ 
+ ORDT sections hold data for decoding index labels.
+ It is mapping of encoded chars to unicode.
+ */
+typedef struct {
+    uint8_t *ordt1; /**< ORDT1 offsets */
+    uint16_t *ordt2; /**< ORDT2 offsets */
+    size_t type; /**< Type (0: 16, 1: 8 bit offsets) */
+    size_t ordt1_pos; /**< Offset of ORDT1 data */
+    size_t ordt2_pos; /**< Offset of ORDT2 data */
+    size_t offsets_count; /**< Offsets count */
+} MOBIOrdt;
+
+MOBI_RET mobi_parse_index(const MOBIData *m, MOBIIndx *indx, const size_t indx_record_number);
+MOBI_RET mobi_parse_indx(const MOBIPdbRecord *indx_record, MOBIIndx *indx, MOBITagx *tagx, MOBIOrdt *ordt);
+MOBI_RET mobi_get_indxentry_tagvalue(uint32_t *tagvalue, const MOBIIndexEntry *entry, const unsigned tag_arr[]);
+size_t mobi_get_indxentry_tagarray(uint32_t **tagarr, const MOBIIndexEntry *entry, const size_t tagid);
+bool mobi_indx_has_tag(const MOBIIndx *indx, const size_t tagid);
+char * mobi_get_cncx_string(const MOBIPdbRecord *cncx_record, const uint32_t cncx_offset);
+char * mobi_get_cncx_string_utf8(const MOBIPdbRecord *cncx_record, const uint32_t cncx_offset, MOBIEncoding cncx_encoding);
+char * mobi_get_cncx_string_flat(const MOBIPdbRecord *cncx_record, const uint32_t cncx_offset, const size_t length);
+MOBI_RET mobi_decode_infl(unsigned char *decoded, int *decoded_size, const unsigned char *rule);
+MOBI_RET mobi_trie_insert_infl(MOBITrie **root, const MOBIIndx *indx, size_t i);
+size_t mobi_trie_get_inflgroups(char **infl_strings, MOBITrie * const root, const char *string);
+
+#endif

app/src/main/cpp/libmobi/src/memory.c

@@ -0,0 +1,444 @@
+/** @file memory.c
+ *  @brief Functions for initializing and releasing structures and data containers
+ *
+ * Copyright (c) 2014 Bartek Fabiszewski
+ * http://www.fabiszewski.net
+ *
+ * This file is part of libmobi.
+ * Licensed under LGPL, either version 3, or any later.
+ * See <http://www.gnu.org/licenses/>
+ */
+
+#include <stdlib.h>
+#include "memory.h"
+#include "debug.h"
+#include "util.h"
+
+/**
+ @brief Initializer for MOBIData structure
+ 
+ It allocates memory for structure.
+ Memory should be freed with mobi_free().
+ 
+ @return MOBIData on success, NULL otherwise
+ */
+MOBIData * mobi_init(void) {
+    MOBIData *m = NULL;
+    m = calloc(1, sizeof(MOBIData));
+    if (m == NULL) { return NULL; }
+    m->use_kf8 = true;
+    m->kf8_boundary_offset = MOBI_NOTSET;
+    m->drm_key = NULL;
+    m->ph = NULL;
+    m->rh = NULL;
+    m->mh = NULL;
+    m->eh = NULL;
+    m->rec = NULL;
+    m->next = NULL;
+    m->internals = NULL;
+    return m;
+}
+
+/**
+ @brief Free MOBIMobiHeader structure
+ 
+ @param[in] mh MOBIMobiHeader structure
+ */
+void mobi_free_mh(MOBIMobiHeader *mh) {
+    if (mh == NULL) {
+        return;
+    }
+    free(mh->header_length);
+    free(mh->mobi_type);
+    free(mh->text_encoding);
+    free(mh->uid);
+    free(mh->version);
+    free(mh->orth_index);
+    free(mh->infl_index);
+    free(mh->names_index);
+    free(mh->keys_index);
+    free(mh->extra0_index);
+    free(mh->extra1_index);
+    free(mh->extra2_index);
+    free(mh->extra3_index);
+    free(mh->extra4_index);
+    free(mh->extra5_index);
+    free(mh->non_text_index);
+    free(mh->full_name_offset);
+    free(mh->full_name_length);
+    free(mh->locale);
+    free(mh->dict_input_lang);
+    free(mh->dict_output_lang);
+    free(mh->min_version);
+    free(mh->image_index);
+    free(mh->huff_rec_index);
+    free(mh->huff_rec_count);
+    free(mh->datp_rec_index);
+    free(mh->datp_rec_count);
+    free(mh->exth_flags);
+    free(mh->unknown6);
+    free(mh->drm_offset);
+    free(mh->drm_count);
+    free(mh->drm_size);
+    free(mh->drm_flags);
+    free(mh->fdst_index);
+    free(mh->first_text_index);
+    free(mh->last_text_index);
+    free(mh->fdst_section_count);
+    //free(mh->unknown9);
+    free(mh->fcis_index);
+    free(mh->fcis_count);
+    free(mh->flis_index);
+    free(mh->flis_count);
+    free(mh->unknown10);
+    free(mh->unknown11);
+    free(mh->srcs_index);
+    free(mh->srcs_count);
+    free(mh->unknown12);
+    free(mh->unknown13);
+    free(mh->extra_flags);
+    free(mh->ncx_index);
+    free(mh->fragment_index);
+    free(mh->skeleton_index);
+    free(mh->unknown14);
+    free(mh->unknown15);
+    free(mh->datp_index);
+    free(mh->guide_index);
+    free(mh->unknown16);
+    free(mh->unknown17);
+    free(mh->unknown18);
+    free(mh->unknown19);
+    free(mh->unknown20);
+    free(mh->full_name);
+    free(mh);
+    mh = NULL;
+}
+
+/**
+ @brief Free all MOBIPdbRecord structures and its respective data attached to MOBIData structure
+ 
+ Each MOBIPdbRecord structure holds metadata and data for each pdb record
+ 
+ @param[in,out] m MOBIData structure
+ */
+void mobi_free_rec(MOBIData *m) {
+    MOBIPdbRecord *curr, *tmp;
+    curr = m->rec;
+    while (curr != NULL) {
+        tmp = curr;
+        curr = curr->next;
+        free(tmp->data);
+        free(tmp);
+        tmp = NULL;
+    }
+    m->rec = NULL;
+}
+
+/**
+ @brief Free all MOBIExthHeader structures and its respective data attached to MOBIData structure
+ 
+ Each MOBIExthHeader structure holds metadata and data for each EXTH record
+ 
+ @param[in,out] m MOBIData structure
+ */
+void mobi_free_eh(MOBIData *m) {
+    MOBIExthHeader *curr, *tmp;
+    curr = m->eh;
+    while (curr != NULL) {
+        tmp = curr;
+        curr = curr->next;
+        free(tmp->data);
+        free(tmp);
+        tmp = NULL;
+    }
+    m->eh = NULL;
+}
+
+/**
+ @brief Free MOBIData structure for currenly unused hybrid part and all its children
+ 
+ @param[in] m MOBIData structure
+ */
+void mobi_free_next(MOBIData *m) {
+    if (m && m->next) {
+        mobi_free_mh(m->next->mh);
+        mobi_free_eh(m->next);
+        free(m->next->rh);
+        free(m->next);
+        m->next = NULL;
+    }
+}
+
+/**
+ @brief Free MOBIData structure and all its children
+ 
+ @param[in] m MOBIData structure
+ */
+void mobi_free(MOBIData *m) {
+    if (m == NULL) {
+        return;
+    }
+    mobi_free_mh(m->mh);
+    mobi_free_eh(m);
+    mobi_free_rec(m);
+    free(m->ph);
+    free(m->rh);
+    mobi_free_next(m);
+    mobi_free_internals(m);
+    free(m);
+    m = NULL;
+}
+
+/**
+ @brief Initialize and return MOBIHuffCdic structure.
+ 
+ MOBIHuffCdic structure holds parsed data from HUFF, CDIC records.
+ It is used for huffman decompression.
+ Initialized structure is a child of MOBIData structure.
+ It must be freed with mobi_free_huffcdic().
+ 
+ @return MOBIHuffCdic on success, NULL otherwise
+ */
+MOBIHuffCdic * mobi_init_huffcdic(void) {
+    MOBIHuffCdic *huffcdic = calloc(1, sizeof(MOBIHuffCdic));
+    if (huffcdic == NULL) {
+        debug_print("%s", "Memory allocation for huffcdic structure failed\n");
+        return NULL;
+    }
+    return huffcdic;
+}
+
+/**
+ @brief Free MOBIHuffCdic structure and all its children
+ 
+ @param[in] huffcdic MOBIData structure
+ */
+void mobi_free_huffcdic(MOBIHuffCdic *huffcdic) {
+    if (huffcdic == NULL) {
+        return;
+    }
+    free(huffcdic->symbol_offsets);
+    free(huffcdic->symbols);
+    free(huffcdic);
+    huffcdic = NULL;
+}
+
+/**
+ @brief Initialize and return MOBIRawml structure.
+ 
+ MOBIRawml structure holds parsed text record metadata.
+ It is used in the process of parsing rawml text data.
+ It must be freed with mobi_free_rawml().
+ 
+ @param[in] m Initialized MOBIData structure
+ @return MOBIRawml on success, NULL otherwise
+ */
+MOBIRawml * mobi_init_rawml(const MOBIData *m) {
+    MOBIRawml *rawml = malloc(sizeof(MOBIRawml));
+    if (rawml == NULL) {
+        debug_print("%s", "Memory allocation failed for rawml structure\n");
+        return NULL;
+    }
+    rawml->version = mobi_get_fileversion(m);
+    rawml->fdst = NULL;
+    rawml->skel = NULL;
+    rawml->frag = NULL;
+    rawml->guide = NULL;
+    rawml->ncx = NULL;
+    rawml->orth = NULL;
+    rawml->infl = NULL;
+    rawml->flow = NULL;
+    rawml->markup = NULL;
+    rawml->resources = NULL;
+    return rawml;
+}
+
+/**
+ @brief Free MOBIFdst structure and all its children
+ 
+ @param[in] fdst MOBIFdst structure
+ */
+void mobi_free_fdst(MOBIFdst *fdst) {
+    if (fdst == NULL) {
+        return;
+    }
+    if (fdst->fdst_section_count > 0) {
+        free(fdst->fdst_section_starts);
+        free(fdst->fdst_section_ends);
+    }
+    free(fdst);
+    fdst = NULL;
+}
+
+/**
+ @brief Initialize and return MOBIIndx structure.
+ 
+ MOBIIndx structure holds INDX index record entries.
+ Must be freed with mobi_free_indx()
+ 
+ @return MOBIIndx on success, NULL otherwise
+ */
+MOBIIndx * mobi_init_indx(void) {
+    MOBIIndx *indx = calloc(1, sizeof(MOBIIndx));
+    if (indx == NULL) {
+        debug_print("%s", "Memory allocation failed for indx structure\n");
+        return NULL;
+    }
+    indx->entries = NULL;
+    indx->cncx_record = NULL;
+    indx->orth_index_name = NULL;
+    return indx;
+}
+
+/**
+ @brief Free index entries data and all its children
+ 
+ @param[in] indx MOBIIndx structure that holds indx->entries
+ */
+void mobi_free_index_entries(MOBIIndx *indx) {
+    if (indx == NULL || indx->entries == NULL) {
+        return;
+    }
+    size_t i = 0;
+    while (i < indx->entries_count) {
+        free(indx->entries[i].label);
+        if (indx->entries[i].tags != NULL) {
+            size_t j = 0;
+            while (j < indx->entries[i].tags_count) {
+                free(indx->entries[i].tags[j++].tagvalues);
+            }
+            free(indx->entries[i].tags);
+        }
+        i++;
+    }
+    free(indx->entries);
+    indx->entries = NULL;
+}
+
+/**
+ @brief Free MOBIIndx structure and all its children
+ 
+ @param[in] indx MOBIIndx structure that holds indx->entries
+ */
+void mobi_free_indx(MOBIIndx *indx) {
+    if (indx == NULL) {
+        return;
+    }
+    mobi_free_index_entries(indx);
+    if (indx->orth_index_name) {
+        free(indx->orth_index_name);
+    }
+    free(indx);
+    indx = NULL;
+}
+
+/**
+ @brief Free MOBITagx structure and all its children
+ 
+ @param[in] tagx MOBITagx structure
+ */
+void mobi_free_tagx(MOBITagx *tagx) {
+    if (tagx == NULL) {
+        return;
+    }
+    free(tagx->tags);
+    free(tagx);
+    tagx = NULL;
+}
+
+/**
+ @brief Free MOBIOrdt structure and all its children
+ 
+ @param[in] ordt MOBIOrdt structure
+ */
+void mobi_free_ordt(MOBIOrdt *ordt) {
+    if (ordt == NULL) {
+        return;
+    }
+    free(ordt->ordt1);
+    free(ordt->ordt2);
+    free(ordt);
+    ordt = NULL;
+}
+
+/**
+ @brief Free MOBIPart structure
+ 
+ Pointer to data may point to memory area also used by record->data. 
+ So we need a flag to leave the memory allocated, while freeing MOBIPart structure
+ 
+ @param[in] part MOBIPart structure
+ @param[in] free_data Flag, if set - a pointer to part->data is also released, otherwise not released
+ */
+void mobi_free_part(MOBIPart *part, int free_data) {
+    MOBIPart *curr, *tmp;
+    curr = part;
+    while (curr != NULL) {
+        tmp = curr;
+        curr = curr->next;
+        if (free_data) { free(tmp->data); }
+        free(tmp);
+    }
+    part = NULL;
+}
+
+/**
+ @brief Free MOBIPart structure for opf and ncx data
+ 
+ @param[in] part MOBIPart structure
+ */
+void mobi_free_opf_data(MOBIPart *part) {
+    while (part != NULL) {
+        if (part->type == T_NCX || part->type == T_OPF) {
+            free(part->data);
+        }
+        part = part->next;
+    }
+}
+
+/**
+ @brief Free MOBIPart structure for decoded font data
+ 
+ @param[in] part MOBIPart structure
+ */
+void mobi_free_font_data(MOBIPart *part) {
+    while (part != NULL) {
+        if (part->type == T_OTF || part->type == T_TTF) {
+            free(part->data);
+        }
+        part = part->next;
+    }
+}
+
+/**
+ @brief Free MOBIRawml structure allocated by mobi_init_rawml()
+ 
+ Pointer to data may point to memory area also used by record->data.
+ So we need a flag to leave the memory allocated, while freeing MOBIPart structure
+ 
+ @param[in] rawml MOBIRawml structure
+ */
+void mobi_free_rawml(MOBIRawml *rawml) {
+    if (rawml == NULL) {
+        return;
+    }
+    mobi_free_fdst(rawml->fdst);
+    mobi_free_indx(rawml->skel);
+    mobi_free_indx(rawml->frag);
+    mobi_free_indx(rawml->guide);
+    mobi_free_indx(rawml->ncx);
+    mobi_free_indx(rawml->orth);
+    mobi_free_indx(rawml->infl);
+    mobi_free_part(rawml->flow, true);
+    mobi_free_part(rawml->markup,true);
+    /* do not free resources data, these are links to records data */
+    /* only free opf and ncx data */
+    mobi_free_opf_data(rawml->resources);
+    /* and free decoded fonts data */
+    mobi_free_font_data(rawml->resources);
+    mobi_free_part(rawml->resources, false);
+    free(rawml);
+    rawml = NULL;
+}
+
+

app/src/main/cpp/libmobi/src/memory.h

@@ -0,0 +1,33 @@
+/** @file memory.h
+ *
+ * Copyright (c) 2014 Bartek Fabiszewski
+ * http://www.fabiszewski.net
+ *
+ * This file is part of libmobi.
+ * Licensed under LGPL, either version 3, or any later.
+ * See <http://www.gnu.org/licenses/>
+ */
+
+#ifndef libmobi_memory_h
+#define libmobi_memory_h
+
+#include "config.h"
+#include "index.h"
+#include "compression.h"
+#include "mobi.h"
+
+void mobi_free_mh(MOBIMobiHeader *mh);
+void mobi_free_rec(MOBIData *m);
+void mobi_free_eh(MOBIData *m);
+void mobi_free_next(MOBIData *m);
+
+MOBIHuffCdic * mobi_init_huffcdic(void);
+void mobi_free_huffcdic(MOBIHuffCdic *huffcdic);
+
+MOBIIndx * mobi_init_indx(void);
+void mobi_free_indx(MOBIIndx *indx);
+void mobi_free_tagx(MOBITagx *tagx);
+void mobi_free_ordt(MOBIOrdt *ordt);
+void mobi_free_index_entries(MOBIIndx *indx);
+
+#endif

app/src/main/cpp/libmobi/src/meta.c

@@ -0,0 +1,864 @@
+/** @file meta.c
+ *  @brief Functions for metadata manipulation
+ *
+ * Copyright (c) 2016 Bartek Fabiszewski
+ * http://www.fabiszewski.net
+ *
+ * This file is part of libmobi.
+ * Licensed under LGPL, either version 3, or any later.
+ * See <http://www.gnu.org/licenses/>
+ */
+
+#define _GNU_SOURCE 1
+#ifndef __USE_BSD
+#define __USE_BSD /* for strdup on linux/glibc */
+#endif
+
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include "meta.h"
+#include "util.h"
+
+/**
+ @brief Get document metadata from exth string
+ 
+ Returned string must be deallocated by caller
+ 
+ @param[in] m MOBIData structure with loaded data
+ @param[in] exth_tag MOBIExthTag
+ @return Pointer to null terminated string, NULL on failure
+ */
+char * mobi_meta_get_exthstring(const MOBIData *m, const MOBIExthTag exth_tag) {
+    char *string = NULL;
+    
+    MOBIExthHeader *exth;
+    MOBIExthHeader *start = NULL;
+    while ((exth = mobi_next_exthrecord_by_tag(m, exth_tag, &start))) {
+        char *exth_string = mobi_decode_exthstring(m, exth->data, exth->size);
+        if (string == NULL) {
+            string = exth_string;
+        } else if (exth_string) {
+            const char *separator = "; ";
+            size_t new_length = strlen(string) + strlen(exth_string) + strlen(separator) + 1;
+            char *new = malloc(new_length);
+            if (new == NULL) {
+                free(string);
+                free(exth_string);
+                return NULL;
+            }
+            strcpy(new, string);
+            strcat(new, separator);
+            strcat(new, exth_string);
+            free(string);
+            free(exth_string);
+            string = new;
+        }
+        if (start == NULL) {
+            break;
+        }
+    }
+    return string;
+}
+
+/**
+ @brief Get document title metadata
+ 
+ Returned string must be deallocated by caller
+ 
+ @param[in] m MOBIData structure with loaded data
+ @return Pointer to null terminated string, NULL on failure
+ */
+char * mobi_meta_get_title(const MOBIData *m) {
+    if (m == NULL) {
+        return NULL;
+    }
+    char *title = mobi_meta_get_exthstring(m, EXTH_UPDATEDTITLE);
+    if (title) {
+        return title;
+    }
+    char fullname[MOBI_TITLE_SIZEMAX + 1];
+    MOBI_RET ret = mobi_get_fullname(m, fullname, MOBI_TITLE_SIZEMAX);
+    if (ret == MOBI_SUCCESS) {
+        title = strdup(fullname);
+    } else if (m->ph) {
+        title = strdup(m->ph->name);
+    }
+    return title;
+}
+
+/**
+ @brief Add document title metadata
+ 
+ @param[in,out] m MOBIData structure with loaded data
+ @param[in] title String value
+ @return Pointer to null terminated string, NULL on failure
+ */
+MOBI_RET mobi_meta_add_title(MOBIData *m, const char *title) {
+    if (title == NULL) {
+        return MOBI_PARAM_ERR;
+    }
+    size_t size = min(strlen(title), UINT32_MAX);
+    return mobi_add_exthrecord(m, EXTH_UPDATEDTITLE, (uint32_t) size, title);
+}
+
+/**
+ @brief Delete all title metadata
+ 
+ @param[in,out] m MOBIData structure with loaded data
+ @return Pointer to null terminated string, NULL on failure
+ */
+MOBI_RET mobi_meta_delete_title(MOBIData *m) {
+    if (mobi_exists_mobiheader(m) && m->mh->full_name) {
+        m->mh->full_name[0] = '\0';
+    }
+    if (mobi_is_hybrid(m) && mobi_exists_mobiheader(m->next) && m->next->mh->full_name) {
+        m->next->mh->full_name[0] = '\0';
+    }
+    return mobi_delete_exthrecord_by_tag(m, EXTH_UPDATEDTITLE);
+}
+
+/**
+ @brief Set document title metadata
+ 
+ Replaces all title metadata with new string
+ 
+ @param[in,out] m MOBIData structure with loaded data
+ @param[in] title String value
+ @return Pointer to null terminated string, NULL on failure
+ */
+MOBI_RET mobi_meta_set_title(MOBIData *m, const char *title) {
+    if (title == NULL) {
+        return MOBI_PARAM_ERR;
+    }
+    /* set title in mobi header */
+    MOBI_RET ret = mobi_set_fullname(m, title);
+    if (ret != MOBI_SUCCESS) {
+        return ret;
+    }
+    /* set title in palm header */
+    ret = mobi_set_pdbname(m, title);
+    if (ret != MOBI_SUCCESS) {
+        return ret;
+    }
+    /* set title in exth header */
+    ret = mobi_delete_exthrecord_by_tag(m, EXTH_UPDATEDTITLE);
+    if (ret == MOBI_SUCCESS) {
+        ret = mobi_meta_add_title(m, title);
+    }
+    return ret;
+}
+
+/**
+ @brief Get document author metadata
+ 
+ Returned string must be deallocated by caller
+ 
+ @param[in] m MOBIData structure with loaded data
+ @return Pointer to null terminated string, NULL on failure
+ */
+char * mobi_meta_get_author(const MOBIData *m) {
+    return mobi_meta_get_exthstring(m, EXTH_AUTHOR);
+}
+
+/**
+ @brief Add document author metadata
+ 
+ @param[in,out] m MOBIData structure with loaded data
+ @param[in] author String value
+ @return Pointer to null terminated string, NULL on failure
+ */
+MOBI_RET mobi_meta_add_author(MOBIData *m, const char *author) {
+    if (author == NULL) {
+        return MOBI_PARAM_ERR;
+    }
+    size_t size = min(strlen(author), UINT32_MAX);
+    return mobi_add_exthrecord(m, EXTH_AUTHOR, (uint32_t) size, author);
+}
+
+/**
+ @brief Delete all author metadata
+ 
+ @param[in,out] m MOBIData structure with loaded data
+ @return Pointer to null terminated string, NULL on failure
+ */
+MOBI_RET mobi_meta_delete_author(MOBIData *m) {
+    return mobi_delete_exthrecord_by_tag(m, EXTH_AUTHOR);
+}
+
+/**
+ @brief Set document author metadata
+ 
+ Replaces all author metadata with new string
+ 
+ @param[in,out] m MOBIData structure with loaded data
+ @param[in] author String value
+ @return Pointer to null terminated string, NULL on failure
+ */
+MOBI_RET mobi_meta_set_author(MOBIData *m, const char *author) {
+    if (author == NULL) {
+        return MOBI_PARAM_ERR;
+    }
+    MOBI_RET ret = mobi_meta_delete_author(m);
+    if (ret == MOBI_SUCCESS) {
+        ret = mobi_meta_add_author(m, author);
+    }
+    return ret;
+}
+
+/**
+ @brief Get document subject metadata
+ 
+ Returned string must be deallocated by caller
+ 
+ @param[in] m MOBIData structure with loaded data
+ @return Pointer to null terminated string, NULL on failure
+ */
+char * mobi_meta_get_subject(const MOBIData *m) {
+    return mobi_meta_get_exthstring(m, EXTH_SUBJECT);
+}
+
+/**
+ @brief Add document subject metadata
+ 
+ @param[in,out] m MOBIData structure with loaded data
+ @param[in] subject String value
+ @return Pointer to null terminated string, NULL on failure
+ */
+MOBI_RET mobi_meta_add_subject(MOBIData *m, const char *subject) {
+    if (subject == NULL) {
+        return MOBI_PARAM_ERR;
+    }
+    size_t size = min(strlen(subject), UINT32_MAX);
+    return mobi_add_exthrecord(m, EXTH_SUBJECT, (uint32_t) size, subject);
+}
+
+/**
+ @brief Delete all subject metadata
+ 
+ @param[in,out] m MOBIData structure with loaded data
+ @return Pointer to null terminated string, NULL on failure
+ */
+MOBI_RET mobi_meta_delete_subject(MOBIData *m) {
+    return mobi_delete_exthrecord_by_tag(m, EXTH_SUBJECT);
+}
+
+/**
+ @brief Set document subject metadata
+ 
+ Replaces all subject metadata with new string
+ 
+ @param[in,out] m MOBIData structure with loaded data
+ @param[in] subject String value
+ @return Pointer to null terminated string, NULL on failure
+ */
+MOBI_RET mobi_meta_set_subject(MOBIData *m, const char *subject) {
+    if (subject == NULL) {
+        return MOBI_PARAM_ERR;
+    }
+    MOBI_RET ret = mobi_meta_delete_subject(m);
+    if (ret == MOBI_SUCCESS) {
+        ret = mobi_meta_add_subject(m, subject);
+    }
+    return ret;
+}
+
+/**
+ @brief Get document publisher metadata
+ 
+ Returned string must be deallocated by caller
+ 
+ @param[in] m MOBIData structure with loaded data
+ @return Pointer to null terminated string, NULL on failure
+ */
+char * mobi_meta_get_publisher(const MOBIData *m) {
+    return mobi_meta_get_exthstring(m, EXTH_PUBLISHER);
+}
+
+/**
+ @brief Add document publisher metadata
+ 
+ @param[in,out] m MOBIData structure with loaded data
+ @param[in] publisher String value
+ @return Pointer to null terminated string, NULL on failure
+ */
+MOBI_RET mobi_meta_add_publisher(MOBIData *m, const char *publisher) {
+    if (publisher == NULL) {
+        return MOBI_PARAM_ERR;
+    }
+    size_t size = min(strlen(publisher), UINT32_MAX);
+    return mobi_add_exthrecord(m, EXTH_PUBLISHER, (uint32_t) size, publisher);
+}
+
+/**
+ @brief Delete all publisher metadata
+ 
+ @param[in,out] m MOBIData structure with loaded data
+ @return Pointer to null terminated string, NULL on failure
+ */
+MOBI_RET mobi_meta_delete_publisher(MOBIData *m) {
+    return mobi_delete_exthrecord_by_tag(m, EXTH_PUBLISHER);
+}
+
+/**
+ @brief Set document publisher metadata
+ 
+ Replaces all publisher metadata with new string
+ 
+ @param[in,out] m MOBIData structure with loaded data
+ @param[in] publisher String value
+ @return Pointer to null terminated string, NULL on failure
+ */
+MOBI_RET mobi_meta_set_publisher(MOBIData *m, const char *publisher) {
+    if (publisher == NULL) {
+        return MOBI_PARAM_ERR;
+    }
+    MOBI_RET ret = mobi_meta_delete_publisher(m);
+    if (ret == MOBI_SUCCESS) {
+        ret = mobi_meta_add_publisher(m, publisher);
+    }
+    return ret;
+}
+
+/**
+ @brief Get document publishing date metadata
+ 
+ Returned string must be deallocated by caller
+ 
+ @param[in] m MOBIData structure with loaded data
+ @return Pointer to null terminated string, NULL on failure
+ */
+char * mobi_meta_get_publishdate(const MOBIData *m) {
+    return mobi_meta_get_exthstring(m, EXTH_PUBLISHINGDATE);
+}
+
+/**
+ @brief Add document publishdate metadata
+ 
+ @param[in,out] m MOBIData structure with loaded data
+ @param[in] publishdate String value
+ @return Pointer to null terminated string, NULL on failure
+ */
+MOBI_RET mobi_meta_add_publishdate(MOBIData *m, const char *publishdate) {
+    if (publishdate == NULL) {
+        return MOBI_PARAM_ERR;
+    }
+    size_t size = min(strlen(publishdate), UINT32_MAX);
+    return mobi_add_exthrecord(m, EXTH_PUBLISHINGDATE, (uint32_t) size, publishdate);
+}
+
+/**
+ @brief Delete all publishdate metadata
+ 
+ @param[in,out] m MOBIData structure with loaded data
+ @return Pointer to null terminated string, NULL on failure
+ */
+MOBI_RET mobi_meta_delete_publishdate(MOBIData *m) {
+    return mobi_delete_exthrecord_by_tag(m, EXTH_PUBLISHINGDATE);
+}
+
+/**
+ @brief Set document publishdate metadata
+ 
+ Replaces all publishdate metadata with new string
+ 
+ @param[in,out] m MOBIData structure with loaded data
+ @param[in] publishdate String value
+ @return Pointer to null terminated string, NULL on failure
+ */
+MOBI_RET mobi_meta_set_publishdate(MOBIData *m, const char *publishdate) {
+    if (publishdate == NULL) {
+        return MOBI_PARAM_ERR;
+    }
+    MOBI_RET ret = mobi_meta_delete_publishdate(m);
+    if (ret == MOBI_SUCCESS) {
+        ret = mobi_meta_add_publishdate(m, publishdate);
+    }
+    return ret;
+}
+
+/**
+ @brief Get document description metadata
+ 
+ Returned string must be deallocated by caller
+ 
+ @param[in] m MOBIData structure with loaded data
+ @return Pointer to null terminated string, NULL on failure
+ */
+char * mobi_meta_get_description(const MOBIData *m) {
+    return mobi_meta_get_exthstring(m, EXTH_DESCRIPTION);
+}
+
+/**
+ @brief Add document description metadata
+ 
+ @param[in,out] m MOBIData structure with loaded data
+ @param[in] description String value
+ @return Pointer to null terminated string, NULL on failure
+ */
+MOBI_RET mobi_meta_add_description(MOBIData *m, const char *description) {
+    if (description == NULL) {
+        return MOBI_PARAM_ERR;
+    }
+    size_t size = min(strlen(description), UINT32_MAX);
+    return mobi_add_exthrecord(m, EXTH_DESCRIPTION, (uint32_t) size, description);
+}
+
+/**
+ @brief Delete all description metadata
+ 
+ @param[in,out] m MOBIData structure with loaded data
+ @return Pointer to null terminated string, NULL on failure
+ */
+MOBI_RET mobi_meta_delete_description(MOBIData *m) {
+    return mobi_delete_exthrecord_by_tag(m, EXTH_DESCRIPTION);
+}
+
+/**
+ @brief Set document description metadata
+ 
+ Replaces all description metadata with new string
+ 
+ @param[in,out] m MOBIData structure with loaded data
+ @param[in] description String value
+ @return Pointer to null terminated string, NULL on failure
+ */
+MOBI_RET mobi_meta_set_description(MOBIData *m, const char *description) {
+    if (description == NULL) {
+        return MOBI_PARAM_ERR;
+    }
+    MOBI_RET ret = mobi_meta_delete_description(m);
+    if (ret == MOBI_SUCCESS) {
+        ret = mobi_meta_add_description(m, description);
+    }
+    return ret;
+}
+
+/**
+ @brief Get document imprint metadata
+ 
+ Returned string must be deallocated by caller
+ 
+ @param[in] m MOBIData structure with loaded data
+ @return Pointer to null terminated string, NULL on failure
+ */
+char * mobi_meta_get_imprint(const MOBIData *m) {
+    return mobi_meta_get_exthstring(m, EXTH_IMPRINT);
+}
+
+/**
+ @brief Add document imprint metadata
+ 
+ @param[in,out] m MOBIData structure with loaded data
+ @param[in] imprint String value
+ @return Pointer to null terminated string, NULL on failure
+ */
+MOBI_RET mobi_meta_add_imprint(MOBIData *m, const char *imprint) {
+    if (imprint == NULL) {
+        return MOBI_PARAM_ERR;
+    }
+    size_t size = min(strlen(imprint), UINT32_MAX);
+    return mobi_add_exthrecord(m, EXTH_IMPRINT, (uint32_t) size, imprint);
+}
+
+/**
+ @brief Delete all imprint metadata
+ 
+ @param[in,out] m MOBIData structure with loaded data
+ @return Pointer to null terminated string, NULL on failure
+ */
+MOBI_RET mobi_meta_delete_imprint(MOBIData *m) {
+    return mobi_delete_exthrecord_by_tag(m, EXTH_IMPRINT);
+}
+
+/**
+ @brief Set document imprint metadata
+ 
+ Replaces all imprint metadata with new string
+ 
+ @param[in,out] m MOBIData structure with loaded data
+ @param[in] imprint String value
+ @return Pointer to null terminated string, NULL on failure
+ */
+MOBI_RET mobi_meta_set_imprint(MOBIData *m, const char *imprint) {
+    if (imprint == NULL) {
+        return MOBI_PARAM_ERR;
+    }
+    MOBI_RET ret = mobi_meta_delete_imprint(m);
+    if (ret == MOBI_SUCCESS) {
+        ret = mobi_meta_add_imprint(m, imprint);
+    }
+    return ret;
+}
+
+/**
+ @brief Get document contributor metadata
+ 
+ Returned string must be deallocated by caller
+ 
+ @param[in] m MOBIData structure with loaded data
+ @return Pointer to null terminated string, NULL on failure
+ */
+char * mobi_meta_get_contributor(const MOBIData *m) {
+    return mobi_meta_get_exthstring(m, EXTH_CONTRIBUTOR);
+}
+
+/**
+ @brief Add document contributor metadata
+ 
+ @param[in,out] m MOBIData structure with loaded data
+ @param[in] contributor String value
+ @return Pointer to null terminated string, NULL on failure
+ */
+MOBI_RET mobi_meta_add_contributor(MOBIData *m, const char *contributor) {
+    if (contributor == NULL) {
+        return MOBI_PARAM_ERR;
+    }
+    size_t size = min(strlen(contributor), UINT32_MAX);
+    return mobi_add_exthrecord(m, EXTH_CONTRIBUTOR, (uint32_t) size, contributor);
+}
+
+/**
+ @brief Delete all contributor metadata
+ 
+ @param[in,out] m MOBIData structure with loaded data
+ @return Pointer to null terminated string, NULL on failure
+ */
+MOBI_RET mobi_meta_delete_contributor(MOBIData *m) {
+    return mobi_delete_exthrecord_by_tag(m, EXTH_CONTRIBUTOR);
+}
+
+/**
+ @brief Set document contributor metadata
+ 
+ Replaces all contributor metadata with new string
+ 
+ @param[in,out] m MOBIData structure with loaded data
+ @param[in] contributor String value
+ @return Pointer to null terminated string, NULL on failure
+ */
+MOBI_RET mobi_meta_set_contributor(MOBIData *m, const char *contributor) {
+    if (contributor == NULL) {
+        return MOBI_PARAM_ERR;
+    }
+    MOBI_RET ret = mobi_meta_delete_contributor(m);
+    if (ret == MOBI_SUCCESS) {
+        ret = mobi_meta_add_contributor(m, contributor);
+    }
+    return ret;
+}
+
+/**
+ @brief Get document review metadata
+ 
+ Returned string must be deallocated by caller
+ 
+ @param[in] m MOBIData structure with loaded data
+ @return Pointer to null terminated string, NULL on failure
+ */
+char * mobi_meta_get_review(const MOBIData *m) {
+    return mobi_meta_get_exthstring(m, EXTH_REVIEW);
+}
+
+/**
+ @brief Add document review metadata
+ 
+ @param[in,out] m MOBIData structure with loaded data
+ @param[in] review String value
+ @return Pointer to null terminated string, NULL on failure
+ */
+MOBI_RET mobi_meta_add_review(MOBIData *m, const char *review) {
+    if (review == NULL) {
+        return MOBI_PARAM_ERR;
+    }
+    size_t size = min(strlen(review), UINT32_MAX);
+    return mobi_add_exthrecord(m, EXTH_REVIEW, (uint32_t) size, review);
+}
+
+/**
+ @brief Delete all review metadata
+ 
+ @param[in,out] m MOBIData structure with loaded data
+ @return Pointer to null terminated string, NULL on failure
+ */
+MOBI_RET mobi_meta_delete_review(MOBIData *m) {
+    return mobi_delete_exthrecord_by_tag(m, EXTH_REVIEW);
+}
+
+/**
+ @brief Set document review metadata
+ 
+ Replaces all review metadata with new string
+ 
+ @param[in,out] m MOBIData structure with loaded data
+ @param[in] review String value
+ @return Pointer to null terminated string, NULL on failure
+ */
+MOBI_RET mobi_meta_set_review(MOBIData *m, const char *review) {
+    if (review == NULL) {
+        return MOBI_PARAM_ERR;
+    }
+    MOBI_RET ret = mobi_meta_delete_review(m);
+    if (ret == MOBI_SUCCESS) {
+        ret = mobi_meta_add_review(m, review);
+    }
+    return ret;
+}
+
+/**
+ @brief Get document copyright metadata
+ 
+ Returned string must be deallocated by caller
+ 
+ @param[in] m MOBIData structure with loaded data
+ @return Pointer to null terminated string, NULL on failure
+ */
+char * mobi_meta_get_copyright(const MOBIData *m) {
+    return mobi_meta_get_exthstring(m, EXTH_RIGHTS);
+}
+
+/**
+ @brief Add document copyright metadata
+ 
+ @param[in,out] m MOBIData structure with loaded data
+ @param[in] copyright String value
+ @return Pointer to null terminated string, NULL on failure
+ */
+MOBI_RET mobi_meta_add_copyright(MOBIData *m, const char *copyright) {
+    if (copyright == NULL) {
+        return MOBI_PARAM_ERR;
+    }
+    size_t size = min(strlen(copyright), UINT32_MAX);
+    return mobi_add_exthrecord(m, EXTH_RIGHTS, (uint32_t) size, copyright);
+}
+
+/**
+ @brief Delete all copyright metadata
+ 
+ @param[in,out] m MOBIData structure with loaded data
+ @return Pointer to null terminated string, NULL on failure
+ */
+MOBI_RET mobi_meta_delete_copyright(MOBIData *m) {
+    return mobi_delete_exthrecord_by_tag(m, EXTH_RIGHTS);
+}
+
+/**
+ @brief Set document copyright metadata
+ 
+ Replaces all copyright metadata with new string
+ 
+ @param[in,out] m MOBIData structure with loaded data
+ @param[in] copyright String value
+ @return Pointer to null terminated string, NULL on failure
+ */
+MOBI_RET mobi_meta_set_copyright(MOBIData *m, const char *copyright) {
+    if (copyright == NULL) {
+        return MOBI_PARAM_ERR;
+    }
+    MOBI_RET ret = mobi_meta_delete_copyright(m);
+    if (ret == MOBI_SUCCESS) {
+        ret = mobi_meta_add_copyright(m, copyright);
+    }
+    return ret;
+}
+
+/**
+ @brief Get document ISBN metadata
+ 
+ Returned string must be deallocated by caller
+ 
+ @param[in] m MOBIData structure with loaded data
+ @return Pointer to null terminated string, NULL on failure
+ */
+char * mobi_meta_get_isbn(const MOBIData *m) {
+    return mobi_meta_get_exthstring(m, EXTH_ISBN);
+}
+
+/**
+ @brief Add document isbn metadata
+ 
+ @param[in,out] m MOBIData structure with loaded data
+ @param[in] isbn String value
+ @return Pointer to null terminated string, NULL on failure
+ */
+MOBI_RET mobi_meta_add_isbn(MOBIData *m, const char *isbn) {
+    if (isbn == NULL) {
+        return MOBI_PARAM_ERR;
+    }
+    size_t size = min(strlen(isbn), UINT32_MAX);
+    return mobi_add_exthrecord(m, EXTH_ISBN, (uint32_t) size, isbn);
+}
+
+/**
+ @brief Delete all isbn metadata
+ 
+ @param[in,out] m MOBIData structure with loaded data
+ @return Pointer to null terminated string, NULL on failure
+ */
+MOBI_RET mobi_meta_delete_isbn(MOBIData *m) {
+    return mobi_delete_exthrecord_by_tag(m, EXTH_ISBN);
+}
+
+/**
+ @brief Set document isbn metadata
+ 
+ Replaces all isbn metadata with new string
+ 
+ @param[in,out] m MOBIData structure with loaded data
+ @param[in] isbn String value
+ @return Pointer to null terminated string, NULL on failure
+ */
+MOBI_RET mobi_meta_set_isbn(MOBIData *m, const char *isbn) {
+    if (isbn == NULL) {
+        return MOBI_PARAM_ERR;
+    }
+    MOBI_RET ret = mobi_meta_delete_isbn(m);
+    if (ret == MOBI_SUCCESS) {
+        ret = mobi_meta_add_isbn(m, isbn);
+    }
+    return ret;
+}
+
+/**
+ @brief Get document ASIN metadata
+ 
+ Returned string must be deallocated by caller
+ 
+ @param[in] m MOBIData structure with loaded data
+ @return Pointer to null terminated string, NULL on failure
+ */
+char * mobi_meta_get_asin(const MOBIData *m) {
+    return mobi_meta_get_exthstring(m, EXTH_ASIN);
+}
+
+/**
+ @brief Add document asin metadata
+ 
+ @param[in,out] m MOBIData structure with loaded data
+ @param[in] asin String value
+ @return Pointer to null terminated string, NULL on failure
+ */
+MOBI_RET mobi_meta_add_asin(MOBIData *m, const char *asin) {
+    if (asin == NULL) {
+        return MOBI_PARAM_ERR;
+    }
+    size_t size = min(strlen(asin), UINT32_MAX);
+    return mobi_add_exthrecord(m, EXTH_ASIN, (uint32_t) size, asin);
+}
+
+/**
+ @brief Delete all asin metadata
+ 
+ @param[in,out] m MOBIData structure with loaded data
+ @return Pointer to null terminated string, NULL on failure
+ */
+MOBI_RET mobi_meta_delete_asin(MOBIData *m) {
+    return mobi_delete_exthrecord_by_tag(m, EXTH_ASIN);
+}
+
+/**
+ @brief Set document asin metadata
+ 
+ Replaces all asin metadata with new string
+ 
+ @param[in,out] m MOBIData structure with loaded data
+ @param[in] asin String value
+ @return Pointer to null terminated string, NULL on failure
+ */
+MOBI_RET mobi_meta_set_asin(MOBIData *m, const char *asin) {
+    if (asin == NULL) {
+        return MOBI_PARAM_ERR;
+    }
+    MOBI_RET ret = mobi_meta_delete_asin(m);
+    if (ret == MOBI_SUCCESS) {
+        ret = mobi_meta_add_asin(m, asin);
+    }
+    return ret;
+}
+
+/**
+ @brief Get document language code metadata
+ 
+ Locale strings are based on IANA language-subtag registry with some custom Mobipocket modifications.
+ See mobi_locale array.
+ 
+ Returned string must be deallocated by caller
+ 
+ @param[in] m MOBIData structure with loaded data
+ @return Pointer to null terminated string, NULL on failure
+ */
+char * mobi_meta_get_language(const MOBIData *m) {
+    if (m == NULL) {
+        return NULL;
+    }
+    char *lang = mobi_meta_get_exthstring(m, EXTH_LANGUAGE);
+    if(lang == NULL && m->mh && m->mh->locale && *m->mh->locale) {
+        const char *locale_string = mobi_get_locale_string(*m->mh->locale);
+        if (locale_string) {
+            lang = strdup(locale_string);
+        }
+    }
+    return lang;
+}
+
+/**
+ @brief Add document language code metadata
+ 
+ Locale strings are based on IANA language-subtag registry with some custom Mobipocket modifications.
+ See mobi_locale array.
+ 
+ @param[in,out] m MOBIData structure with loaded data
+ @param[in] language String value
+ @return Pointer to null terminated string, NULL on failure
+ */
+MOBI_RET mobi_meta_add_language(MOBIData *m, const char *language) {
+    if (language == NULL) {
+        return MOBI_PARAM_ERR;
+    }
+    size_t size = min(strlen(language), UINT32_MAX);
+    return mobi_add_exthrecord(m, EXTH_LANGUAGE, (uint32_t) size, language);
+}
+
+/**
+ @brief Delete all language code metadata
+ 
+ @param[in,out] m MOBIData structure with loaded data
+ @return Pointer to null terminated string, NULL on failure
+ */
+MOBI_RET mobi_meta_delete_language(MOBIData *m) {
+    if(mobi_exists_mobiheader(m) && m->mh->locale) {
+        *m->mh->locale = 0;
+    }
+    if(mobi_is_hybrid(m) && mobi_exists_mobiheader(m->next) && m->next->mh->locale) {
+        *m->next->mh->locale = 0;
+    }
+    return mobi_delete_exthrecord_by_tag(m, EXTH_LANGUAGE);
+}
+
+/**
+ @brief Set document language code metadata
+ 
+ Replaces all language metadata with new string
+ Locale strings are based on IANA language-subtag registry with some custom Mobipocket modifications.
+ See mobi_locale array.
+ 
+ @param[in,out] m MOBIData structure with loaded data
+ @param[in] language String value
+ @return Pointer to null terminated string, NULL on failure
+ */
+MOBI_RET mobi_meta_set_language(MOBIData *m, const char *language) {
+    if (language == NULL) {
+        return MOBI_PARAM_ERR;
+    }
+    MOBI_RET ret = mobi_meta_delete_language(m);
+    if (ret == MOBI_SUCCESS) {
+        ret = mobi_meta_add_language(m, language);
+    }
+    if(mobi_exists_mobiheader(m) && m->mh->locale) {
+        *m->mh->locale = (uint32_t) mobi_get_locale_number(language);
+    }
+    if(mobi_is_hybrid(m) && mobi_exists_mobiheader(m->next) && m->next->mh->locale) {
+        *m->next->mh->locale = (uint32_t) mobi_get_locale_number(language);
+    }
+    return ret;
+}

app/src/main/cpp/libmobi/src/meta.h

@@ -0,0 +1,17 @@
+/** @file meta.h
+ *
+ * Copyright (c) 2016 Bartek Fabiszewski
+ * http://www.fabiszewski.net
+ *
+ * This file is part of libmobi.
+ * Licensed under LGPL, either version 3, or any later.
+ * See <http://www.gnu.org/licenses/>
+ */
+
+#ifndef libmobi_meta_h
+#define libmobi_meta_h
+
+#include "config.h"
+#include "mobi.h"
+
+#endif /* libmobi_meta_h */

app/src/main/cpp/libmobi/src/miniz.h

@@ -0,0 +1,24 @@
+/** @file miniz.h
+ *  @brief header file for third party miniz.c, zlib replacement
+ *
+ * Copyright (c) 2014 Bartek Fabiszewski
+ * http://www.fabiszewski.net
+ *
+ * This file is part of libmobi.
+ * Licensed under LGPL, either version 3, or any later.
+ * See <http://www.gnu.org/licenses/>
+ */
+
+#ifndef libmobi_miniz_h
+#define libmobi_miniz_h
+
+#define MINIZ_HEADER_FILE_ONLY
+#define MINIZ_NO_STDIO
+#define MINIZ_NO_ARCHIVE_APIS
+#define MINIZ_NO_ZLIB_COMPATIBLE_NAMES
+#define MINIZ_NO_TIME
+#define MINIZ_NO_ARCHIVE_WRITING_APIS
+
+#include "miniz.c"
+
+#endif

app/src/main/cpp/libmobi/src/mobi.h

@@ -0,0 +1,623 @@
+/** @file mobi.h
+ *  @brief Libmobi main header file
+ *
+ * This file is installed with the library.
+ * Include it in your project with "#include <mobi.h>".
+ * See aryan of usage in mobitool.c, mobimeta.c, mobidrm.c
+ *
+ * Copyright (c) 2014-2022 Bartek Fabiszewski
+ * http://www.fabiszewski.net
+ *
+ * This file is part of libmobi.
+ * Licensed under LGPL, either version 3, or any later.
+ * See <http://www.gnu.org/licenses/>
+ */
+
+#ifndef libmobi_mobi_h
+#define libmobi_mobi_h
+
+#include <stdio.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <time.h>
+
+/** @brief Visibility attributes for symbol export */
+#if defined (__CYGWIN__) || defined (__MINGW32__)
+#define MOBI_EXPORT __attribute__((visibility("default"))) __declspec(dllexport) extern
+#elif defined (_WIN32)
+#define MOBI_EXPORT __declspec(dllexport)
+#else
+#define MOBI_EXPORT __attribute__((__visibility__("default")))
+#endif
+
+/** 
+ @brief Usually 32-bit values in mobi records
+ with value 0xffffffff mean "value not set"
+ */
+#define MOBI_NOTSET UINT32_MAX
+
+#define MOBI_ENCRYPTION_NONE 0 /**< Text record encryption type: none */
+#define MOBI_ENCRYPTION_V1 1 /**< Text record encryption type: old mobipocket */
+#define MOBI_ENCRYPTION_V2 2 /**< Text record encryption type: mobipocket */
+
+#define MOBI_COMPRESSION_NONE 1 /**< Text record compression type: none */
+#define MOBI_COMPRESSION_PALMDOC 2 /**< Text record compression type: palmdoc */
+#define MOBI_COMPRESSION_HUFFCDIC 17480 /**< Text record compression type: huff/cdic */
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+    /**
+     @defgroup mobi_enums Exported enums
+     @{
+     */
+    
+    /**
+     @brief Error codes returned by functions
+     */
+    typedef enum {
+        MOBI_SUCCESS = 0, /**< Generic success return value */
+        MOBI_ERROR = 1, /**< Generic error return value */
+        MOBI_PARAM_ERR = 2, /**< Wrong function parameter */
+        MOBI_DATA_CORRUPT = 3, /**< Corrupted data */
+        MOBI_FILE_NOT_FOUND = 4, /**< File not found */
+        MOBI_FILE_ENCRYPTED = 5, /**< Unsupported encrypted data */
+        MOBI_FILE_UNSUPPORTED = 6, /**< Unsupported document type */
+        MOBI_MALLOC_FAILED = 7, /**< Memory allocation error */
+        MOBI_INIT_FAILED = 8, /**< Initialization error */
+        MOBI_BUFFER_END = 9, /**< Out of buffer error */
+        MOBI_XML_ERR = 10, /**< XMLwriter error */
+        MOBI_DRM_PIDINV = 11,  /**< Invalid DRM PID */
+        MOBI_DRM_KEYNOTFOUND = 12,  /**< Key not found */
+        MOBI_DRM_UNSUPPORTED = 13, /**< DRM support not included */
+        MOBI_WRITE_FAILED = 14, /**< Writing to file failed */
+        MOBI_DRM_EXPIRED = 15, /**< DRM expired */
+        MOBI_DRM_RANDOM_ERR = 16 /**< DRM random bytes generation failed */
+    } MOBI_RET;
+    
+    /**
+     @brief EXTH record types
+     */
+    typedef enum {
+        EXTH_NUMERIC = 0,
+        EXTH_STRING = 1,
+        EXTH_BINARY = 2
+    } MOBIExthType;
+    
+    /**
+     @brief EXTH record tags
+     */
+    typedef enum {
+        EXTH_DRMSERVER = 1,
+        EXTH_DRMCOMMERCE = 2,
+        EXTH_DRMEBOOKBASE = 3,
+        
+        EXTH_TITLE = 99, /**< <dc:title> */
+        EXTH_AUTHOR = 100, /**< <dc:creator> */
+        EXTH_PUBLISHER = 101, /**< <dc:publisher> */
+        EXTH_IMPRINT = 102, /**< <imprint> */
+        EXTH_DESCRIPTION = 103, /**< <dc:description> */
+        EXTH_ISBN = 104, /**< <dc:identifier opf:scheme="ISBN"> */
+        EXTH_SUBJECT = 105, /**< <dc:subject> */
+        EXTH_PUBLISHINGDATE = 106, /**< <dc:date> */
+        EXTH_REVIEW = 107, /**< <review> */
+        EXTH_CONTRIBUTOR = 108, /**< <dc:contributor> */
+        EXTH_RIGHTS = 109, /**< <dc:rights> */
+        EXTH_SUBJECTCODE = 110, /**< <dc:subject BASICCode="subjectcode"> */
+        EXTH_TYPE = 111, /**< <dc:type> */
+        EXTH_SOURCE = 112, /**< <dc:source> */
+        EXTH_ASIN = 113,
+        EXTH_VERSION = 114,
+        EXTH_SAMPLE = 115,
+        EXTH_STARTREADING = 116, /**< Start reading */
+        EXTH_ADULT = 117, /**< <adult> */
+        EXTH_PRICE = 118, /**< <srp> */
+        EXTH_CURRENCY = 119, /**< <srp currency="currency"> */
+        EXTH_KF8BOUNDARY = 121,
+        EXTH_FIXEDLAYOUT = 122, /**< <fixed-layout> */
+        EXTH_BOOKTYPE = 123, /**< <book-type> */
+        EXTH_ORIENTATIONLOCK = 124, /**< <orientation-lock> */
+        EXTH_COUNTRESOURCES = 125,
+        EXTH_ORIGRESOLUTION = 126, /**< <original-resolution> */
+        EXTH_ZEROGUTTER = 127, /**< <zero-gutter> */
+        EXTH_ZEROMARGIN = 128, /**< <zero-margin> */
+        EXTH_KF8COVERURI = 129,
+        EXTH_RESCOFFSET = 131,
+        EXTH_REGIONMAGNI = 132, /**< <region-mag> */
+        
+        EXTH_DICTNAME = 200, /**< <DictionaryVeryShortName> */
+        EXTH_COVEROFFSET = 201, /**< <EmbeddedCover> */
+        EXTH_THUMBOFFSET = 202,
+        EXTH_HASFAKECOVER = 203,
+        EXTH_CREATORSOFT = 204,
+        EXTH_CREATORMAJOR = 205,
+        EXTH_CREATORMINOR = 206,
+        EXTH_CREATORBUILD = 207,
+        EXTH_WATERMARK = 208,
+        EXTH_TAMPERKEYS = 209,
+        
+        EXTH_FONTSIGNATURE = 300,
+        
+        EXTH_CLIPPINGLIMIT = 401,
+        EXTH_PUBLISHERLIMIT = 402,
+        EXTH_UNK403 = 403,
+        EXTH_TTSDISABLE = 404,
+        EXTH_READFORFREE = 405, // uint32_t, rental related, ReadForFree
+        EXTH_RENTAL = 406, // uint64_t
+        EXTH_UNK407 = 407,
+        EXTH_UNK450 = 450,
+        EXTH_UNK451 = 451,
+        EXTH_UNK452 = 452,
+        EXTH_UNK453 = 453,
+        
+        EXTH_DOCTYPE = 501, /**< PDOC - Personal Doc; EBOK - ebook; EBSP - ebook sample; */
+        EXTH_LASTUPDATE = 502,
+        EXTH_UPDATEDTITLE = 503,
+        EXTH_ASIN504 = 504,
+        EXTH_TITLEFILEAS = 508,
+        EXTH_CREATORFILEAS = 517,
+        EXTH_PUBLISHERFILEAS = 522,
+        EXTH_LANGUAGE = 524, /**< <dc:language> */
+        EXTH_ALIGNMENT = 525, /**< <primary-writing-mode> */
+        EXTH_CREATORSTRING = 526,
+        EXTH_PAGEDIR = 527,
+        EXTH_OVERRIDEFONTS = 528, /**< <override-kindle-fonts> */
+        EXTH_SORCEDESC = 529,
+        EXTH_DICTLANGIN = 531,
+        EXTH_DICTLANGOUT = 532,
+        EXTH_INPUTSOURCE = 534,
+        EXTH_CREATORBUILDREV = 535,
+    } MOBIExthTag;
+    
+    /**
+     @brief Types of files stored in database records
+     */
+    typedef enum {
+        T_UNKNOWN, /**< unknown */
+        /* markup */
+        T_HTML, /**< html */
+        T_CSS, /**< css */
+        T_SVG, /**< svg */
+        T_OPF, /**< opf */
+        T_NCX, /**< ncx */
+        /* images */
+        T_JPG, /**< jpg */
+        T_GIF, /**< gif */
+        T_PNG, /**< png */
+        T_BMP, /**< bmp */
+        /* fonts */
+        T_OTF, /**< otf */
+        T_TTF, /**< ttf */
+        /* media */
+        T_MP3, /**< mp3 */
+        T_MPG, /**< mp3 */
+        T_PDF, /**< pdf */
+        /* generic types */
+        T_FONT, /**< encoded font */
+        T_AUDIO, /**< audio resource */
+        T_VIDEO, /**< video resource */
+        T_BREAK /**< end of file */
+    } MOBIFiletype;
+    
+    /**
+     @brief Metadata of file types
+     */
+    typedef struct {
+        MOBIFiletype type; /**< MOBIFiletype type */
+        char extension[5]; /**< file extension */
+        char mime_type[30]; /**< mime-type */
+    } MOBIFileMeta;
+    
+    /**
+     @brief Encoding types in MOBI header (offset 28)
+     */
+    typedef enum {
+        MOBI_CP1252 = 1252, /**< cp-1252 encoding */
+        MOBI_UTF8 = 65001, /**< utf-8 encoding */
+        MOBI_UTF16 = 65002, /**< utf-16 encoding */
+    } MOBIEncoding;
+
+    /** @} */
+    
+    /**
+     @defgroup raw_structs Exported structures for the raw, unparsed records metadata and data
+     @{
+     */
+
+    /**
+     @brief Header of palmdoc database file
+     */
+    typedef struct  {
+        char name[33]; /**< 0: Database name, zero terminated, trimmed title (+author) */
+        uint16_t attributes; /**< 32: Attributes bitfield, PALMDB_ATTRIBUTE_DEFAULT */
+        uint16_t version; /**< 34: File version, PALMDB_VERSION_DEFAULT */
+        uint32_t ctime; /**< 36: Creation time */
+        uint32_t mtime; /**< 40: Modification time */
+        uint32_t btime; /**< 44: Backup time */
+        uint32_t mod_num; /**< 48: Modification number, PALMDB_MODNUM_DEFAULT */
+        uint32_t appinfo_offset; /**< 52: Offset to application info (if present) or zero, PALMDB_APPINFO_DEFAULT */
+        uint32_t sortinfo_offset; /**< 56: Offset to sort info (if present) or zero, PALMDB_SORTINFO_DEFAULT */
+        char type[5]; /**< 60: Database type, zero terminated, PALMDB_TYPE_DEFAULT */
+        char creator[5]; /**< 64: Creator type, zero terminated, PALMDB_CREATOR_DEFAULT */
+        uint32_t uid; /**< 68: Used internally to identify record */
+        uint32_t next_rec; /**< 72: Used only when database is loaded into memory, PALMDB_NEXTREC_DEFAULT */
+        uint16_t rec_count; /**< 76: Number of records in the file */
+    } MOBIPdbHeader;
+
+    /**
+     @brief Metadata and data of a record. All records form a linked list.
+     */
+    typedef struct MOBIPdbRecord {
+        uint32_t offset; /**< Offset of the record data from the start of the database */
+        size_t size; /**< Calculated size of the record data */
+        uint8_t attributes; /**< Record attributes */
+        uint32_t uid; /**< Record unique id, usually sequential even numbers */
+        unsigned char *data; /**< Record data */
+        struct MOBIPdbRecord *next; /**< Pointer to the next record or NULL */
+    } MOBIPdbRecord;
+
+    /**
+     @brief Metadata and data of a EXTH record. All records form a linked list.
+     */
+    typedef struct MOBIExthHeader {
+        uint32_t tag; /**< Record tag */
+        uint32_t size; /**< Data size */
+        void *data; /**< Record data */
+        struct MOBIExthHeader *next; /**< Pointer to the next record or NULL */
+    } MOBIExthHeader;
+    
+    /** 
+     @brief EXTH tag metadata
+     */
+    typedef struct {
+        MOBIExthTag tag; /**< Record tag id */
+        MOBIExthType type; /**< EXTH_NUMERIC, EXTH_STRING or EXTH_BINARY */
+        char *name; /**< Tag name */
+    } MOBIExthMeta;
+    
+    /**
+     @brief Header of the Record 0 meta-record
+     */
+    typedef struct {
+        /* PalmDOC header (extended), offset 0, length 16 */
+        uint16_t compression_type; /**< 0; 1 == no compression, 2 = PalmDOC compression, 17480 = HUFF/CDIC compression */
+        /* uint16_t unused; // 2; 0 */
+        uint32_t text_length; /**< 4; uncompressed length of the entire text of the book */
+        uint16_t text_record_count; /**< 8; number of PDB records used for the text of the book */
+        uint16_t text_record_size; /**< 10; maximum size of each record containing text, always 4096 */
+        uint16_t encryption_type; /**< 12; 0 == no encryption, 1 = Old Mobipocket Encryption, 2 = Mobipocket Encryption */
+        uint16_t unknown1; /**< 14; usually 0 */
+    } MOBIRecord0Header;
+
+    /**
+     @brief MOBI header which follows Record 0 header
+     
+     All MOBI header fields are pointers. Some fields are not present in the header, then the pointer is NULL.
+     */
+    typedef struct {
+        /* MOBI header, offset 16 */
+        char mobi_magic[5]; /**< 16: M O B I { 77, 79, 66, 73 }, zero terminated */
+        uint32_t *header_length; /**< 20: the length of the MOBI header, including the previous 4 bytes */
+        uint32_t *mobi_type; /**< 24: mobipocket file type */
+        MOBIEncoding *text_encoding; /**< 28: 1252 = CP1252, 65001 = UTF-8 */
+        uint32_t *uid; /**< 32: unique id */
+        uint32_t *version; /**< 36: mobipocket format */
+        uint32_t *orth_index; /**< 40: section number of orthographic meta index. MOBI_NOTSET if index is not available. */
+        uint32_t *infl_index; /**< 44: section number of inflection meta index. MOBI_NOTSET if index is not available. */
+        uint32_t *names_index; /**< 48: section number of names meta index. MOBI_NOTSET if index is not available. */
+        uint32_t *keys_index; /**< 52: section number of keys meta index. MOBI_NOTSET if index is not available. */
+        uint32_t *extra0_index; /**< 56: section number of extra 0 meta index. MOBI_NOTSET if index is not available. */
+        uint32_t *extra1_index; /**< 60: section number of extra 1 meta index. MOBI_NOTSET if index is not available. */
+        uint32_t *extra2_index; /**< 64: section number of extra 2 meta index. MOBI_NOTSET if index is not available. */
+        uint32_t *extra3_index; /**< 68: section number of extra 3 meta index. MOBI_NOTSET if index is not available. */
+        uint32_t *extra4_index; /**< 72: section number of extra 4 meta index. MOBI_NOTSET if index is not available. */
+        uint32_t *extra5_index; /**< 76: section number of extra 5 meta index. MOBI_NOTSET if index is not available. */
+        uint32_t *non_text_index; /**< 80: first record number (starting with 0) that's not the book's text */
+        uint32_t *full_name_offset; /**< 84: offset in record 0 (not from start of file) of the full name of the book */
+        uint32_t *full_name_length; /**< 88: length of the full name */
+        uint32_t *locale; /**< 92: first byte is main language: 09 = English, next byte is dialect, 08 = British, 04 = US */
+        uint32_t *dict_input_lang; /**< 96: input language for a dictionary */
+        uint32_t *dict_output_lang; /**< 100: output language for a dictionary */
+        uint32_t *min_version; /**< 104: minimum mobipocket version support needed to read this file. */
+        uint32_t *image_index; /**< 108: first record number (starting with 0) that contains an image (sequential) */
+        uint32_t *huff_rec_index; /**< 112: first huffman compression record */
+        uint32_t *huff_rec_count; /**< 116: huffman compression records count */
+        uint32_t *datp_rec_index; /**< 120: section number of DATP record */
+        uint32_t *datp_rec_count; /**< 124: DATP records count */
+        uint32_t *exth_flags; /**< 128: bitfield. if bit 6 (0x40) is set, then there's an EXTH record */
+        /* 32 unknown bytes, usually 0, related to encryption and unknown6 */
+        /* unknown2 */
+        /* unknown3 */
+        /* unknown4 */
+        /* unknown5 */
+        uint32_t *unknown6; /**< 164: use MOBI_NOTSET , related to encryption*/
+        uint32_t *drm_offset; /**< 168: offset to DRM key info in DRMed files. MOBI_NOTSET if no DRM */
+        uint32_t *drm_count; /**< 172: number of entries in DRM info */
+        uint32_t *drm_size; /**< 176: number of bytes in DRM info */
+        uint32_t *drm_flags; /**< 180: some flags concerning DRM info, bit 0 set if password encryption */
+        /* 8 unknown bytes 0? */
+        /* unknown7 */
+        /* unknown8 */
+        uint16_t *first_text_index; /**< 192: section number of first text record */
+        uint16_t *last_text_index; /**< 194: */
+        uint32_t *fdst_index; /**< 192 (KF8) section number of FDST record */
+        //uint32_t *unknown9; /**< 196: */
+        uint32_t *fdst_section_count; /**< 196 (KF8) */
+        uint32_t *fcis_index; /**< 200: section number of FCIS record */
+        uint32_t *fcis_count; /**< 204: FCIS records count */
+        uint32_t *flis_index; /**< 208: section number of FLIS record */
+        uint32_t *flis_count; /**< 212: FLIS records count */
+        uint32_t *unknown10; /**< 216: */
+        uint32_t *unknown11; /**< 220: */
+        uint32_t *srcs_index; /**< 224: section number of SRCS record */
+        uint32_t *srcs_count; /**< 228: SRCS records count */
+        uint32_t *unknown12; /**< 232: */
+        uint32_t *unknown13; /**< 236: */
+        /* uint16_t fill 0 */
+        uint16_t *extra_flags; /**< 242: extra flags */
+        uint32_t *ncx_index; /**< 244: section number of NCX record  */
+        uint32_t *unknown14; /**< 248: */
+        uint32_t *fragment_index; /**< 248 (KF8) section number of fragments record */
+        uint32_t *unknown15; /**< 252: */
+        uint32_t *skeleton_index; /**< 252 (KF8) section number of SKEL record */
+        uint32_t *datp_index; /**< 256: section number of DATP record */
+        uint32_t *unknown16; /**< 260: */
+        uint32_t *guide_index; /**< 260 (KF8) section number of guide record */
+        uint32_t *unknown17; /**< 264: */
+        uint32_t *unknown18; /**< 268: */
+        uint32_t *unknown19; /**< 272: */
+        uint32_t *unknown20; /**< 276: */
+        char *full_name; /**< variable offset (full_name_offset): full name */
+    } MOBIMobiHeader;
+
+    /**
+     @brief Main structure holding all metadata and unparsed records data
+     
+     In case of hybrid KF7/KF8 file there are two Records 0.
+     In such case MOBIData is a circular linked list of two independent records, one structure per each Record 0 header.
+     Records data (MOBIPdbRecord structure) is not duplicated in such case - each struct holds same pointers to all records data.
+     */
+    typedef struct MOBIData {
+        bool use_kf8; /**< Flag: if set to true (default), KF8 part of hybrid file is parsed, if false - KF7 part will be parsed */
+        uint32_t kf8_boundary_offset; /**< Set to KF8 boundary rec number if present, otherwise: MOBI_NOTSET */
+        unsigned char *drm_key; /**< @deprecated Will be removed in future versions */
+        MOBIPdbHeader *ph; /**< Palmdoc database header structure or NULL if not loaded */
+        MOBIRecord0Header *rh; /**< Record0 header structure or NULL if not loaded */
+        MOBIMobiHeader *mh; /**< MOBI header structure or NULL if not loaded */
+        MOBIExthHeader *eh; /**< Linked list of EXTH records or NULL if not loaded */
+        MOBIPdbRecord *rec; /**< Linked list of palmdoc database records or NULL if not loaded */
+        struct MOBIData *next; /**< Pointer to the other part of hybrid file or NULL if not a hybrid file */
+        void *internals;  /**< Used internally*/
+    } MOBIData;
+    
+    /** @} */ // end of raw_structs group
+
+    /**
+     @defgroup parsed_structs Exported structures for the parsed records metadata and data
+     @{
+     */
+    
+    /**
+     @brief Parsed FDST record
+     
+     FDST record contains offsets of main sections in RAWML - raw text data.
+     The sections are usually html part, css parts, svg part.
+     */
+    typedef struct {
+        size_t fdst_section_count; /**< Number of main sections */
+        uint32_t *fdst_section_starts; /**< Array of section start offsets */
+        uint32_t *fdst_section_ends; /**< Array of section end offsets */
+    } MOBIFdst;
+    
+    /**
+     @brief Parsed tag for an index entry
+     */
+    typedef struct {
+        size_t tagid; /**< Tag id */
+        size_t tagvalues_count; /**< Number of tag values */
+        uint32_t *tagvalues; /**< Array of tag values */
+    } MOBIIndexTag;
+
+    /**
+     @brief Parsed INDX index entry
+     */
+    typedef struct {
+        char *label; /**< Entry string, zero terminated */
+        size_t tags_count; /**< Number of tags */
+        MOBIIndexTag *tags; /**< Array of tags */
+    } MOBIIndexEntry;
+
+    /**
+     @brief Parsed INDX record
+     */
+    typedef struct {
+        size_t type; /**< Index type: 0 - normal, 2 - inflection */
+        size_t entries_count; /**< Index entries count */
+        MOBIEncoding encoding; /**< Index encoding */
+        size_t total_entries_count; /**< Total index entries count */
+        size_t ordt_offset; /**< ORDT offset */
+        size_t ligt_offset; /**< LIGT offset */
+        size_t ligt_entries_count; /**< LIGT index entries count */
+        size_t cncx_records_count; /**< Number of compiled NCX records */
+        MOBIPdbRecord *cncx_record; /**< Link to CNCX record */
+        MOBIIndexEntry *entries; /**< Index entries array */
+        char *orth_index_name; /**< Orth index name */
+    } MOBIIndx;
+    
+    /**
+     @brief Reconstructed source file.
+     
+     All file parts are organized in a linked list.
+     */
+    typedef struct MOBIPart {
+        size_t uid; /**< Unique id */
+        MOBIFiletype type; /**< File type */
+        size_t size; /**< File size */
+        unsigned char *data; /**< File data */
+        struct MOBIPart *next; /**< Pointer to next part or NULL */
+    } MOBIPart;
+    
+    /**
+     @brief Main structure containing reconstructed source parts and indices
+    */
+    typedef struct {
+        size_t version; /**< Version of Mobipocket document */
+        MOBIFdst *fdst; /**< Parsed FDST record or NULL if not present */
+        MOBIIndx *skel; /**< Parsed skeleton index or NULL if not present */
+        MOBIIndx *frag; /**< Parsed fragments index or NULL if not present */
+        MOBIIndx *guide; /**< Parsed guide index or NULL if not present */
+        MOBIIndx *ncx; /**< Parsed NCX index or NULL if not present */
+        MOBIIndx *orth; /**< Parsed orth index or NULL if not present */
+        MOBIIndx *infl; /**< Parsed infl index or NULL if not present */
+        MOBIPart *flow; /**< Linked list of reconstructed main flow parts or NULL if not present */
+        MOBIPart *markup; /**< Linked list of reconstructed markup files or NULL if not present */
+        MOBIPart *resources; /**< Linked list of reconstructed resources files or NULL if not present */
+    } MOBIRawml;
+
+    /** @} */ // end of parsed_structs group
+    
+    /** 
+     @defgroup mobi_export Functions exported by the library
+     @{
+     */
+    MOBI_EXPORT const char * mobi_version(void);
+    MOBI_EXPORT MOBI_RET mobi_load_file(MOBIData *m, FILE *file);
+    MOBI_EXPORT MOBI_RET mobi_load_filename(MOBIData *m, const char *path);
+    
+    MOBI_EXPORT MOBIData * mobi_init(void);
+    MOBI_EXPORT void mobi_free(MOBIData *m);
+    
+    MOBI_EXPORT MOBI_RET mobi_parse_kf7(MOBIData *m);
+    MOBI_EXPORT MOBI_RET mobi_parse_kf8(MOBIData *m);
+    
+    MOBI_EXPORT MOBI_RET mobi_parse_rawml(MOBIRawml *rawml, const MOBIData *m);
+    MOBI_EXPORT MOBI_RET mobi_parse_rawml_opt(MOBIRawml *rawml, const MOBIData *m, bool parse_toc, bool parse_dict, bool reconstruct);
+
+    MOBI_EXPORT MOBI_RET mobi_get_rawml(const MOBIData *m, char *text, size_t *len);
+    MOBI_EXPORT MOBI_RET mobi_dump_rawml(const MOBIData *m, FILE *file);
+    MOBI_EXPORT MOBI_RET mobi_decode_font_resource(unsigned char **decoded_font, size_t *decoded_size, MOBIPart *part);
+    MOBI_EXPORT MOBI_RET mobi_decode_audio_resource(unsigned char **decoded_resource, size_t *decoded_size, MOBIPart *part);
+    MOBI_EXPORT MOBI_RET mobi_decode_video_resource(unsigned char **decoded_resource, size_t *decoded_size, MOBIPart *part);
+    MOBI_EXPORT MOBI_RET mobi_get_embedded_source(unsigned char **data, size_t *size, const MOBIData *m);
+    MOBI_EXPORT MOBI_RET mobi_get_embedded_log(unsigned char **data, size_t *size, const MOBIData *m);
+    
+    MOBI_EXPORT MOBIPdbRecord * mobi_get_record_by_uid(const MOBIData *m, const size_t uid);
+    MOBI_EXPORT MOBIPdbRecord * mobi_get_record_by_seqnumber(const MOBIData *m, const size_t uid);
+    MOBI_EXPORT MOBIPart * mobi_get_flow_by_uid(const MOBIRawml *rawml, const size_t uid);
+    MOBI_EXPORT MOBIPart * mobi_get_flow_by_fid(const MOBIRawml *rawml, const char *fid);
+    MOBI_EXPORT MOBIPart * mobi_get_resource_by_uid(const MOBIRawml *rawml, const size_t uid);
+    MOBI_EXPORT MOBIPart * mobi_get_resource_by_fid(const MOBIRawml *rawml, const char *fid);
+    MOBI_EXPORT MOBIPart * mobi_get_part_by_uid(const MOBIRawml *rawml, const size_t uid);
+    MOBI_EXPORT MOBI_RET mobi_get_fullname(const MOBIData *m, char *fullname, const size_t len);
+    MOBI_EXPORT size_t mobi_get_first_resource_record(const MOBIData *m);
+    MOBI_EXPORT size_t mobi_get_text_maxsize(const MOBIData *m);
+    MOBI_EXPORT uint16_t mobi_get_textrecord_maxsize(const MOBIData *m);
+    MOBI_EXPORT size_t mobi_get_kf8offset(const MOBIData *m);
+    MOBI_EXPORT size_t mobi_get_kf8boundary_seqnumber(const MOBIData *m);
+    MOBI_EXPORT size_t mobi_get_record_extrasize(const MOBIPdbRecord *record, const uint16_t flags);
+    MOBI_EXPORT size_t mobi_get_record_mb_extrasize(const MOBIPdbRecord *record, const uint16_t flags);
+    MOBI_EXPORT size_t mobi_get_fileversion(const MOBIData *m);
+    MOBI_EXPORT size_t mobi_get_fdst_record_number(const MOBIData *m);
+    MOBI_EXPORT MOBIExthHeader * mobi_get_exthrecord_by_tag(const MOBIData *m, const MOBIExthTag tag);
+    MOBI_EXPORT MOBIExthHeader * mobi_next_exthrecord_by_tag(const MOBIData *m, const MOBIExthTag tag, MOBIExthHeader **start);
+    MOBI_EXPORT MOBI_RET mobi_delete_exthrecord_by_tag(MOBIData *m, const MOBIExthTag tag);
+    MOBI_EXPORT MOBI_RET mobi_add_exthrecord(MOBIData *m, const MOBIExthTag tag, const uint32_t size, const void *value);
+    MOBI_EXPORT MOBIExthMeta mobi_get_exthtagmeta_by_tag(const MOBIExthTag tag);
+    MOBI_EXPORT MOBIFileMeta mobi_get_filemeta_by_type(const MOBIFiletype type);
+    MOBI_EXPORT uint32_t mobi_decode_exthvalue(const unsigned char *data, const size_t size);
+    MOBI_EXPORT char * mobi_decode_exthstring(const MOBIData *m, const unsigned char *data, const size_t size);
+    MOBI_EXPORT struct tm * mobi_pdbtime_to_time(const long pdb_time);
+    MOBI_EXPORT const char * mobi_get_locale_string(const uint32_t locale);
+    MOBI_EXPORT size_t mobi_get_locale_number(const char *locale_string);
+    MOBI_EXPORT uint32_t mobi_get_orth_entry_offset(const MOBIIndexEntry *entry);
+    MOBI_EXPORT uint32_t mobi_get_orth_entry_length(const MOBIIndexEntry *entry);
+    MOBI_EXPORT MOBI_RET mobi_remove_hybrid_part(MOBIData *m, const bool remove_kf8);
+
+    MOBI_EXPORT bool mobi_exists_mobiheader(const MOBIData *m);
+    MOBI_EXPORT bool mobi_exists_fdst(const MOBIData *m);
+    MOBI_EXPORT bool mobi_exists_skel_indx(const MOBIData *m);
+    MOBI_EXPORT bool mobi_exists_frag_indx(const MOBIData *m);
+    MOBI_EXPORT bool mobi_exists_guide_indx(const MOBIData *m);
+    MOBI_EXPORT bool mobi_exists_ncx(const MOBIData *m);
+    MOBI_EXPORT bool mobi_exists_orth(const MOBIData *m);
+    MOBI_EXPORT bool mobi_exists_infl(const MOBIData *m);
+    MOBI_EXPORT bool mobi_is_hybrid(const MOBIData *m);
+    MOBI_EXPORT bool mobi_is_encrypted(const MOBIData *m);
+    MOBI_EXPORT bool mobi_is_mobipocket(const MOBIData *m);
+    MOBI_EXPORT bool mobi_is_dictionary(const MOBIData *m);
+    MOBI_EXPORT bool mobi_is_kf8(const MOBIData *m);
+    MOBI_EXPORT bool mobi_is_replica(const MOBIData *m);
+    MOBI_EXPORT bool mobi_is_rawml_kf8(const MOBIRawml *rawml);
+    MOBI_EXPORT MOBIRawml * mobi_init_rawml(const MOBIData *m);
+    MOBI_EXPORT void mobi_free_rawml(MOBIRawml *rawml);
+    
+    MOBI_EXPORT char * mobi_meta_get_title(const MOBIData *m);
+    MOBI_EXPORT char * mobi_meta_get_author(const MOBIData *m);
+    MOBI_EXPORT char * mobi_meta_get_publisher(const MOBIData *m);
+    MOBI_EXPORT char * mobi_meta_get_imprint(const MOBIData *m);
+    MOBI_EXPORT char * mobi_meta_get_description(const MOBIData *m);
+    MOBI_EXPORT char * mobi_meta_get_isbn(const MOBIData *m);
+    MOBI_EXPORT char * mobi_meta_get_subject(const MOBIData *m);
+    MOBI_EXPORT char * mobi_meta_get_publishdate(const MOBIData *m);
+    MOBI_EXPORT char * mobi_meta_get_review(const MOBIData *m);
+    MOBI_EXPORT char * mobi_meta_get_contributor(const MOBIData *m);
+    MOBI_EXPORT char * mobi_meta_get_copyright(const MOBIData *m);
+    MOBI_EXPORT char * mobi_meta_get_asin(const MOBIData *m);
+    MOBI_EXPORT char * mobi_meta_get_language(const MOBIData *m);
+    MOBI_EXPORT MOBI_RET mobi_meta_set_title(MOBIData *m, const char *title);
+    MOBI_EXPORT MOBI_RET mobi_meta_add_title(MOBIData *m, const char *title);
+    MOBI_EXPORT MOBI_RET mobi_meta_delete_title(MOBIData *m);
+    MOBI_EXPORT MOBI_RET mobi_meta_set_author(MOBIData *m, const char *author);
+    MOBI_EXPORT MOBI_RET mobi_meta_add_author(MOBIData *m, const char *author);
+    MOBI_EXPORT MOBI_RET mobi_meta_delete_author(MOBIData *m);
+    MOBI_EXPORT MOBI_RET mobi_meta_set_publisher(MOBIData *m, const char *publisher);
+    MOBI_EXPORT MOBI_RET mobi_meta_add_publisher(MOBIData *m, const char *publisher);
+    MOBI_EXPORT MOBI_RET mobi_meta_delete_publisher(MOBIData *m);
+    MOBI_EXPORT MOBI_RET mobi_meta_set_imprint(MOBIData *m, const char *imprint);
+    MOBI_EXPORT MOBI_RET mobi_meta_add_imprint(MOBIData *m, const char *imprint);
+    MOBI_EXPORT MOBI_RET mobi_meta_delete_imprint(MOBIData *m);
+    MOBI_EXPORT MOBI_RET mobi_meta_set_description(MOBIData *m, const char *description);
+    MOBI_EXPORT MOBI_RET mobi_meta_add_description(MOBIData *m, const char *description);
+    MOBI_EXPORT MOBI_RET mobi_meta_delete_description(MOBIData *m);
+    MOBI_EXPORT MOBI_RET mobi_meta_set_isbn(MOBIData *m, const char *isbn);
+    MOBI_EXPORT MOBI_RET mobi_meta_add_isbn(MOBIData *m, const char *isbn);
+    MOBI_EXPORT MOBI_RET mobi_meta_delete_isbn(MOBIData *m);
+    MOBI_EXPORT MOBI_RET mobi_meta_set_subject(MOBIData *m, const char *subject);
+    MOBI_EXPORT MOBI_RET mobi_meta_add_subject(MOBIData *m, const char *subject);
+    MOBI_EXPORT MOBI_RET mobi_meta_delete_subject(MOBIData *m);
+    MOBI_EXPORT MOBI_RET mobi_meta_set_publishdate(MOBIData *m, const char *publishdate);
+    MOBI_EXPORT MOBI_RET mobi_meta_add_publishdate(MOBIData *m, const char *publishdate);
+    MOBI_EXPORT MOBI_RET mobi_meta_delete_publishdate(MOBIData *m);
+    MOBI_EXPORT MOBI_RET mobi_meta_set_review(MOBIData *m, const char *review);
+    MOBI_EXPORT MOBI_RET mobi_meta_add_review(MOBIData *m, const char *review);
+    MOBI_EXPORT MOBI_RET mobi_meta_delete_review(MOBIData *m);
+    MOBI_EXPORT MOBI_RET mobi_meta_set_contributor(MOBIData *m, const char *contributor);
+    MOBI_EXPORT MOBI_RET mobi_meta_add_contributor(MOBIData *m, const char *contributor);
+    MOBI_EXPORT MOBI_RET mobi_meta_delete_contributor(MOBIData *m);
+    MOBI_EXPORT MOBI_RET mobi_meta_set_copyright(MOBIData *m, const char *copyright);
+    MOBI_EXPORT MOBI_RET mobi_meta_add_copyright(MOBIData *m, const char *copyright);
+    MOBI_EXPORT MOBI_RET mobi_meta_delete_copyright(MOBIData *m);
+    MOBI_EXPORT MOBI_RET mobi_meta_set_asin(MOBIData *m, const char *asin);
+    MOBI_EXPORT MOBI_RET mobi_meta_add_asin(MOBIData *m, const char *asin);
+    MOBI_EXPORT MOBI_RET mobi_meta_delete_asin(MOBIData *m);
+    MOBI_EXPORT MOBI_RET mobi_meta_set_language(MOBIData *m, const char *language);
+    MOBI_EXPORT MOBI_RET mobi_meta_add_language(MOBIData *m, const char *language);
+    MOBI_EXPORT MOBI_RET mobi_meta_delete_language(MOBIData *m);
+    
+    MOBI_EXPORT MOBI_RET mobi_drm_setkey(MOBIData *m, const char *pid);
+    MOBI_EXPORT MOBI_RET mobi_drm_setkey_serial(MOBIData *m, const char *serial);
+    MOBI_EXPORT MOBI_RET mobi_drm_addvoucher(MOBIData *m, const char *serial, const time_t valid_from, const time_t valid_to,
+                                             const MOBIExthTag *tamperkeys, const size_t tamperkeys_count);
+    MOBI_EXPORT MOBI_RET mobi_drm_delkey(MOBIData *m);
+    MOBI_EXPORT MOBI_RET mobi_drm_decrypt(MOBIData *m);
+    MOBI_EXPORT MOBI_RET mobi_drm_encrypt(MOBIData *m);
+
+    MOBI_EXPORT MOBI_RET mobi_write_file(FILE *file, MOBIData *m);
+    /** @} */ // end of mobi_export group
+    
+#ifdef __cplusplus
+}
+#endif
+
+#endif

app/src/main/cpp/libmobi/src/opf.h

@@ -0,0 +1,164 @@
+/** @file opf.h
+ *
+ * Copyright (c) 2014 Bartek Fabiszewski
+ * http://www.fabiszewski.net
+ *
+ * This file is part of libmobi.
+ * Licensed under LGPL, either version 3, or any later.
+ * See <http://www.gnu.org/licenses/>
+ */
+
+#ifndef libmobi_opf_h
+#define libmobi_opf_h
+
+#include "config.h"
+#include "mobi.h"
+
+/** @brief Maximum number of opf meta tags */
+#define OPF_META_MAX_TAGS 256
+
+/**
+ @defgroup mobi_opf OPF handling structures
+ @{
+ */
+
+/** @brief OPF <dc:identifier/> element structure
+ 
+ At least one identifier must have an id specified,
+ so it can be referenced from the package unique-identifier attribute.
+ */
+typedef struct {
+    char *value; /**< element value */
+    char *id; /**< id attribute */
+    char *scheme; /**< opf:scheme (optional) */
+} OPFidentifier;
+
+/** @brief OPF <dc:creator/> element structure
+ 
+ Also applies to <dc:contributor/> element
+ */
+typedef struct {
+    char *value; /**< element value */
+    char *file_as; /**< opf:file-as attribute (optional) */
+    char *role; /**< opf:role attribute (optional) */
+} OPFcreator;
+
+/** @brief OPF <dc:subject/> element structure */
+typedef struct {
+    char *value; /**< element value */
+    char *basic_code; /**< BASICCode attribute (optional, non-standard) */
+} OPFsubject;
+
+/** @brief OPF <dc:date/> element structure
+ 
+ Format: YYYY[-MM[-DD]]
+ */
+typedef struct {
+    char *value; /**< element value */
+    char *event; /**< opf:event attribute (optional) */
+} OPFdate;
+
+/** @brief OPF <dc-metadata/> element structure */
+typedef struct {
+    OPFcreator **contributor; /**< <dc:contributor/> element (optional) */
+    OPFcreator **creator; /**< <dc:creator/> element (optional) */
+    OPFidentifier **identifier; /**< <dc:identifier/> element (required) */
+    OPFsubject **subject; /**< <dc:subject/> element (optional) */
+    OPFdate **date; /**< <dc:date/> element (optional) */
+    char **description; /**< <dc:description/> element (optional) */
+    char **language; /**< <dc:language/> element (required) */
+    char **publisher; /**< <dc:publisher/> element (optional) */
+    char **rights; /**< <dc:rights/> element (optional) */
+    char **source; /**< <dc:source/> element (optional) */
+    char **title; /**< <dc:title/> element (required) */
+    char **type; /**< <dc:type/> element (optional) */
+} OPFdcmeta;
+
+/** @brief OPF <srp/> element structure */
+typedef struct {
+    char *value; /**< element value */
+    char *currency; /**< currency attribute */
+} OPFsrp;
+
+/** @brief OPF <x-metadata/> element structure */
+typedef struct {
+    OPFsrp **srp; /**< <srp/> element */
+    char **adult; /**< <adult/> element */
+    char **default_lookup_index; /**< <DefaultLookupIndex/> element */
+    char **dict_short_name; /**< <DictionaryVeryShortName/> element */
+    char **dictionary_in_lang; /**< <DictionaryInLanguage/> element */
+    char **dictionary_out_lang; /**< <DictionaryOutLanguage/> element */
+    char **embedded_cover; /**< <EmbeddedCover/> element */
+    char **imprint; /**< <imprint/> element */
+    char **review; /**< <review/> element */
+} OPFxmeta;
+
+/** @brief OPF <meta/> element structure */
+typedef struct {
+    char *name; /**< name attribute (required) */
+    char *content; /**< content attribute (required) */
+} OPFmeta;
+
+/** @brief OPF <metadata/> element structure */
+typedef struct {
+    OPFmeta **meta; /**< <meta/> element (optional) */
+    OPFdcmeta *dc_meta; /**< <dc-metadata/> element */
+    OPFxmeta *x_meta; /**< <x-metadata/> element */
+} OPFmetadata;
+
+/** @brief OPF <item/> element structure */
+typedef struct {
+    char *id; /**< id attribute (required) */
+    char *href; /**< href attribute (required) */
+    char *media_type; /**< media-type attribute (required) */
+} OPFitem;
+
+/** @brief OPF <manifest/> element structure */
+typedef struct {
+    OPFitem **item; /**< <item/> element */
+} OPFmanifest;
+
+/** @brief OPF <spine/> element structure */
+typedef struct {
+    char *toc; /**< toc attribute (required) */
+    char **itemref; /**< <itemref idref="xxx"/> element */
+} OPFspine;
+
+/** @brief OPF <reference/> tag structure */
+typedef struct {
+    char *type; /**< type attribute (required) */
+    char *title; /**< title attribute */
+    char *href; /**< href attribute (required) */
+} OPFreference;
+
+/** @brief OPF <guide/> element structure */
+typedef struct {
+    OPFreference **reference; /**< <reference/> element tag */
+} OPFguide;
+
+/** @brief OPF <package/> element structure */
+typedef struct {
+    //char *uid; /**< <package unique-identifier="uid"/> */
+    OPFmetadata *metadata; /**< <metadata/> (required) */
+    OPFmanifest *manifest; /**< <manifest/> (required) */
+    OPFspine *spine; /**< <spine/> (required) */
+    OPFguide *guide; /**< <guide/> (optional) */
+} OPF;
+
+/** @brief NCX index entry structure */
+typedef struct {
+    size_t id; /**< Sequential id */
+    char *text; /**< Entry text content */
+    char *target; /**< Entry target reference */
+    size_t level; /**< Entry level */
+    size_t parent; /**< Entry parent */
+    size_t first_child; /**< First child id */
+    size_t last_child; /**< Last child id */
+} NCX;
+/** @} */
+
+
+MOBI_RET mobi_build_opf(MOBIRawml *rawml, const MOBIData *m);
+MOBI_RET mobi_build_ncx(MOBIRawml *rawml, const OPF *opf);
+
+#endif

app/src/main/cpp/libmobi/src/parse_rawml.h

@@ -0,0 +1,42 @@
+/** @file parse_rawml.h
+ *
+ * Copyright (c) 2014 Bartek Fabiszewski
+ * http://www.fabiszewski.net
+ *
+ * This file is part of libmobi.
+ * Licensed under LGPL, either version 3, or any later.
+ * See <http://www.gnu.org/licenses/>
+ */
+
+#ifndef mobi_parse_rawml_h
+#define mobi_parse_rawml_h
+
+#include "config.h"
+#include "mobi.h"
+
+#define MOBI_ATTRNAME_MAXSIZE 150 /**< Maximum length of tag attribute name, like "href" */
+#define MOBI_ATTRVALUE_MAXSIZE 150 /**< Maximum length of tag attribute value */
+
+/**
+ @brief Result data returned by mobi_search_links_kf7() and mobi_search_links_kf8()
+ */
+typedef struct {
+    unsigned char *start; /**< Beginning data to be replaced */
+    unsigned char *end; /**< End of data to be replaced */
+    char value[MOBI_ATTRVALUE_MAXSIZE + 1]; /**< Attribute value */
+    bool is_url; /**< True if value is part of css url attribute */
+} MOBIResult;
+
+/**
+ @brief HTML attribute type
+ */
+typedef enum {
+    ATTR_ID = 0, /**< Attribute 'id' */
+    ATTR_NAME /**< Attribute 'name' */
+} MOBIAttrType;
+
+
+MOBI_RET mobi_get_id_by_posoff(uint32_t *file_number, char *id, const MOBIRawml *rawml, const size_t pos_fid, const size_t pos_off, MOBIAttrType *pref_attr);
+MOBI_RET mobi_find_attrvalue(MOBIResult *result, const unsigned char *data_start, const unsigned char *data_end, const MOBIFiletype type, const char *needle);
+
+#endif

app/src/main/cpp/libmobi/src/randombytes.c

@@ -0,0 +1,375 @@
+/** @file randombytes.c
+ *  @brief Portable function for generating random data
+ *  
+ * Copyright (c) 2022 Bartek Fabiszewski
+ * http://www.fabiszewski.net
+ *
+ * This file is part of libmobi.
+ * Licensed under LGPL, either version 3, or any later.
+ * See <http://www.gnu.org/licenses/>
+ *
+ * This code is based on libsodium's randombytes_buf function
+ * We just extract the single function we need from libsodium and  adjust it for our use.
+ * Most of the code originates from:
+ * https://github.com/jedisct1/libsodium/blob/d250858c7445b7de94e912b529b81defe20d4aaa/src/libsodium/randombytes/sysrandom/randombytes_sysrandom.c
+ * Original code uses following license:
+ *
+ * ISC License
+ *
+ * Copyright (c) 2013-2022
+ * Frank Denis <j at pureftpd dot org>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <stdint.h>
+#include <string.h>
+#ifndef _WIN32
+# include <unistd.h>
+#endif
+#include <stdlib.h>
+
+#include "config.h"
+#include "randombytes.h"
+#include "debug.h"
+
+#include <sys/types.h>
+#ifndef _WIN32
+# include <sys/stat.h>
+# include <sys/time.h>
+#endif
+#ifdef __linux__
+# define _LINUX_SOURCE
+#endif
+#ifdef HAVE_SYS_RANDOM_H
+# include <sys/random.h>
+#endif
+#ifdef __linux__
+# define BLOCK_ON_DEV_RANDOM
+# include <poll.h>
+# ifdef HAVE_GETRANDOM
+#  define HAVE_LINUX_COMPATIBLE_GETRANDOM
+# else
+#  include <sys/syscall.h>
+#  if defined(SYS_getrandom) && defined(__NR_getrandom)
+#   define getrandom(B, S, F) syscall(SYS_getrandom, (B), (int) (S), (F))
+#   define HAVE_LINUX_COMPATIBLE_GETRANDOM
+#  endif
+# endif
+#elif defined(__FreeBSD__) || defined(__DragonFly__)
+# include <sys/param.h>
+# if (defined(__FreeBSD_version) && __FreeBSD_version >= 1200000) || \
+     (defined(__DragonFly_version) && __DragonFly_version >= 500700)
+#  define HAVE_LINUX_COMPATIBLE_GETRANDOM
+# endif
+#endif
+
+#define UNUSED(x) (void)(x)
+
+typedef struct {
+    int random_data_source_fd;
+    int getrandom_available;
+} MOBIRandom;
+
+#ifdef _WIN32
+
+# include <windows.h>
+# define RtlGenRandom SystemFunction036
+# if defined(__cplusplus)
+extern "C"
+# endif
+BOOLEAN NTAPI RtlGenRandom(PVOID RandomBuffer, ULONG RandomBufferLength);
+# ifdef _MSC_VER
+#  pragma comment(lib, "advapi32.lib")
+# endif
+#endif
+
+#if defined(__OpenBSD__) || defined(__CloudABI__) || defined(__wasi__)
+# define HAVE_SAFE_ARC4RANDOM
+#endif
+
+#ifdef HAVE_SAFE_ARC4RANDOM
+
+/**
+ @brief Read a buffer of random bytes using arc4random_buf call
+ 
+ @param[in,out] handle Handle
+ @param[in,out] buf Buffer
+ @param[in] size Buffer size
+ @return MOBI_RET status code (on success MOBI_SUCCESS)
+ */
+static MOBI_RET mobi_randombytes_sysrandom_buf(MOBIRandom *handle, void *buf, const size_t size) {
+    UNUSED(handle);
+    arc4random_buf(buf, size);
+    return MOBI_SUCCESS;
+}
+
+#else /* HAVE_SAFE_ARC4RANDOM */
+
+# ifndef _WIN32
+/**
+ @brief Read a buffer of random bytes from file descriptoir
+ 
+ @param[in] fd File descriptior
+ @param[in,out] buf_ Buffer
+ @param[in] size Buffer size
+ @return Number of bytes read
+ */
+static ssize_t mobi_safe_read(const int fd, void *buf_, size_t size) {
+    unsigned char *buf = (unsigned char *) buf_;
+    ssize_t readnb;
+
+    do {
+        while ((readnb = read(fd, buf, size)) < (ssize_t) 0 && (errno == EINTR || errno == EAGAIN));
+        if (readnb < (ssize_t) 0) {
+            return readnb;
+        }
+        if (readnb == (ssize_t) 0) {
+            break;
+        }
+        size -= (size_t) readnb;
+        buf += readnb;
+    } while (size > (ssize_t) 0);
+
+    return (ssize_t) (buf - (unsigned char *) buf_);
+}
+
+#  ifdef BLOCK_ON_DEV_RANDOM
+/**
+ @brief Block on /dev/random until enough entropy is available
+ 
+ @return MOBI_RET status code (on success MOBI_SUCCESS)
+ */
+static MOBI_RET mobi_randombytes_block_on_dev_random(void) {
+    int fd = open("/dev/random", O_RDONLY);
+    if (fd == -1) {
+        return MOBI_SUCCESS;
+    }
+    struct pollfd pfd;
+    pfd.fd = fd;
+    pfd.events = POLLIN;
+    pfd.revents = 0;
+    int pret;
+    do {
+        pret = poll(&pfd, 1, -1);
+    } while (pret < 0 && (errno == EINTR || errno == EAGAIN));
+    if (pret != 1) {
+        (void) close(fd);
+        errno = EIO;
+        return MOBI_DRM_RANDOM_ERR;
+    }
+    if (close(fd) != 0) {
+        return MOBI_DRM_RANDOM_ERR;
+    }
+    return MOBI_SUCCESS;
+}
+#  endif /* BLOCK_ON_DEV_RANDOM */
+
+/**
+ @brief Open random device, wait for enough entropy if supported
+ 
+ @return Random device file descriptor
+ */
+static int mobi_randombytes_sysrandom_random_dev_open(void) {
+
+#  ifdef BLOCK_ON_DEV_RANDOM
+    if (mobi_randombytes_block_on_dev_random() != MOBI_SUCCESS) {
+        return -1;
+    }
+#  endif
+
+    static const char *devices[] = {
+        "/dev/urandom",
+        "/dev/random", NULL
+    };
+    const char **device = devices;
+
+    do {
+        int fd = open(*device, O_RDONLY);
+        if (fd != -1) {
+            struct stat st;
+            if (fstat(fd, &st) == 0 &&
+#  ifdef S_ISNAM
+                (S_ISNAM(st.st_mode) || S_ISCHR(st.st_mode))
+#  else
+                S_ISCHR(st.st_mode)
+#  endif
+               ) {
+#  if defined(F_SETFD) && defined(FD_CLOEXEC)
+                (void) fcntl(fd, F_SETFD, fcntl(fd, F_GETFD) | FD_CLOEXEC);
+#  endif
+                return fd;
+            }
+            (void) close(fd);
+        } else if (errno == EINTR) {
+            continue;
+        }
+        device++;
+    } while (*device != NULL);
+
+    errno = EIO;
+    return -1;
+}
+
+#  ifdef HAVE_LINUX_COMPATIBLE_GETRANDOM
+/**
+ @brief Read a buffer of random bytes using getrandom system call
+ In libmobi we only need small KEYSIZE buffer, so we don't have to handle buffers over 256 bytes and read chunks
+ 
+ @param[in,out] buf Buffer
+ @param[in] size Buffer size (up to 256 bytes)
+ @return MOBI_RET status code (on success MOBI_SUCCESS)
+ */
+static MOBI_RET mobi_randombytes_linux_getrandom(void *buf, const size_t size) {
+
+    if (size > 256U) {
+        debug_print("This function can only handle buffer size up to 256 bytes (%zu requested)\n", size);
+        return MOBI_PARAM_ERR;
+    }
+    int readnb;
+    do {
+        readnb = getrandom(buf, size, 0);
+    } while (readnb < 0 && (errno == EINTR || errno == EAGAIN));
+
+    if (readnb != (int) size) {
+        debug_print("Getrandom failed (%s)\n", strerror(errno));
+        return MOBI_DRM_RANDOM_ERR;
+    }
+    return MOBI_SUCCESS;
+}
+
+#  endif /* HAVE_LINUX_COMPATIBLE_GETRANDOM */
+
+/**
+ @brief Initialize random data source
+ 
+ @param[in,out] handle Handle
+ @return MOBI_RET status code (on success MOBI_SUCCESS)
+ */
+static MOBI_RET mobi_randombytes_sysrandom_init(MOBIRandom *handle) {
+#  define NEEDS_INIT
+    const int errno_save = errno;
+
+#  ifdef HAVE_LINUX_COMPATIBLE_GETRANDOM
+    {
+        unsigned char fodder[16];
+
+        if (mobi_randombytes_linux_getrandom(fodder, sizeof fodder) == MOBI_SUCCESS) {
+            handle->getrandom_available = 1;
+            errno = errno_save;
+            return MOBI_SUCCESS;
+        }
+        handle->getrandom_available = 0;
+    }
+#  endif
+
+    if ((handle->random_data_source_fd = mobi_randombytes_sysrandom_random_dev_open()) == -1) {
+        debug_print("Couldn't open random device (%s)\n", strerror(errno));
+        return MOBI_DRM_RANDOM_ERR;
+    }
+    errno = errno_save;
+    return MOBI_SUCCESS;
+}
+
+/**
+ @brief Initialize random data source
+ 
+ @param[in,out] handle Handle
+ @return MOBI_RET status code (on success MOBI_SUCCESS)
+ */
+static MOBI_RET mobi_randombytes_sysrandom_close(MOBIRandom *handle) {
+#  define NEEDS_CLOSE
+    MOBI_RET ret = MOBI_DRM_RANDOM_ERR;
+    if (handle->random_data_source_fd != -1 && close(handle->random_data_source_fd) == 0) {
+        handle->random_data_source_fd = -1;
+        ret = MOBI_SUCCESS;
+    }
+#  ifdef HAVE_LINUX_COMPATIBLE_GETRANDOM
+    if (handle->getrandom_available != 0) {
+        ret = MOBI_SUCCESS;
+    }
+#  endif
+    return ret;
+}
+
+# endif /* _WIN32 */
+
+/**
+ @brief Read a buffer of random bytes
+ 
+ @param[in,out] handle Handle
+ @param[in,out] buf Buffer
+ @param[in] size Buffer size (up to 256 bytes)
+ @return MOBI_RET status code (on success MOBI_SUCCESS)
+ */
+static MOBI_RET mobi_randombytes_sysrandom_buf(MOBIRandom *handle, void *buf, const size_t size) {
+# ifndef _WIN32
+#  ifdef HAVE_LINUX_COMPATIBLE_GETRANDOM
+    if (handle->getrandom_available != 0) {
+        return mobi_randombytes_linux_getrandom(buf, size);
+    }
+#  endif
+    if (handle->random_data_source_fd == -1 ||
+        mobi_safe_read(handle->random_data_source_fd, buf, size) != (ssize_t) size) {
+        return MOBI_DRM_RANDOM_ERR;
+    }
+# else /* _WIN32 */
+    UNUSED(handle);
+    if (! RtlGenRandom((PVOID) buf, (ULONG) size)) {
+        return MOBI_DRM_RANDOM_ERR;
+    }
+# endif /* _WIN32 */
+    return MOBI_SUCCESS;
+}
+
+#endif /* HAVE_SAFE_ARC4RANDOM */
+
+/**
+ @brief Fill buffer with random bytes
+ 
+ @param[in,out] buf Buffer
+ @param[in] size Buffer size (up to 256 bytes)
+ @return MOBI_RET status code (on success MOBI_SUCCESS)
+ */
+MOBI_RET mobi_randombytes(void *buf, const size_t size) {
+    
+    MOBIRandom handle = {
+        .random_data_source_fd = -1,
+        .getrandom_available = 0
+    };
+    
+    MOBI_RET ret;
+#ifdef NEEDS_INIT
+    ret = mobi_randombytes_sysrandom_init(&handle);
+    if (ret != MOBI_SUCCESS) {
+        return ret;
+    }
+#endif
+    
+    if (size > (size_t) 0U) {
+        ret = mobi_randombytes_sysrandom_buf(&handle, buf, size);
+        if (ret != MOBI_SUCCESS) {
+            debug_print("%s\n", "Generating random data failed");
+            return ret;
+        }
+    }
+#ifdef NEEDS_CLOSE
+    if (mobi_randombytes_sysrandom_close(&handle) != MOBI_SUCCESS) {
+        debug_print("%s\n", "Closing random data source failed");
+    }
+#endif
+    return MOBI_SUCCESS;
+}

app/src/main/cpp/libmobi/src/randombytes.h

@@ -0,0 +1,25 @@
+/** @file randombytes.h
+ *
+ * Copyright (c) 2021 Bartek Fabiszewski
+ * http://www.fabiszewski.net
+ *
+ * This file is part of libmobi.
+ * Licensed under LGPL, either version 3, or any later.
+ * See <http://www.gnu.org/licenses/>
+ */
+
+#ifndef libmobi_randombytes_h
+#define libmobi_randombytes_h
+
+#include "mobi.h"
+
+/**
+ @brief Write n random bytes of high quality to buf
+ 
+ @param[in,out] buf Buffer to be filled with random bytes
+ @param[in] len Buffer length
+ @return On success returns MOBI_SUCCESS
+ */
+MOBI_RET mobi_randombytes(void *buf, const size_t len);
+
+#endif

app/src/main/cpp/libmobi/src/read.c

@@ -0,0 +1,924 @@
+/** @file read.c
+ *  @brief Functions for reading and parsing of MOBI document
+ *
+ * Copyright (c) 2014 Bartek Fabiszewski
+ * http://www.fabiszewski.net
+ *
+ * This file is part of libmobi.
+ * Licensed under LGPL, either version 3, or any later.
+ * See <http://www.gnu.org/licenses/>
+ */
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "read.h"
+#include "util.h"
+#include "index.h"
+#include "debug.h"
+
+/**
+ @brief Read palm database header from file into MOBIData structure (MOBIPdbHeader)
+ 
+ @param[in,out] m MOBIData structure to be filled with read data
+ @param[in] file Filedescriptor to read from
+ @return MOBI_RET status code (on success MOBI_SUCCESS)
+ */
+MOBI_RET mobi_load_pdbheader(MOBIData *m, FILE *file) {
+    if (m == NULL) {
+        debug_print("%s", "Mobi structure not initialized\n");
+        return MOBI_INIT_FAILED;
+    }
+    if (!file) {
+        return MOBI_FILE_NOT_FOUND;
+    }
+    MOBIBuffer *buf = mobi_buffer_init(PALMDB_HEADER_LEN);
+    if (buf == NULL) {
+        debug_print("%s\n", "Memory allocation failed");
+        return MOBI_MALLOC_FAILED;
+    }
+    const size_t len = fread(buf->data, 1, PALMDB_HEADER_LEN, file);
+    if (len != PALMDB_HEADER_LEN) {
+        mobi_buffer_free(buf);
+        return MOBI_DATA_CORRUPT;
+    }
+    m->ph = calloc(1, sizeof(MOBIPdbHeader));
+    if (m->ph == NULL) {
+        debug_print("%s", "Memory allocation for pdb header failed\n");
+        mobi_buffer_free(buf);
+        return MOBI_MALLOC_FAILED;
+    }
+    /* parse header */
+    mobi_buffer_getstring(m->ph->name, buf, PALMDB_NAME_SIZE_MAX);
+    m->ph->attributes = mobi_buffer_get16(buf);
+    m->ph->version = mobi_buffer_get16(buf);
+    m->ph->ctime = mobi_buffer_get32(buf);
+    m->ph->mtime = mobi_buffer_get32(buf);
+    m->ph->btime = mobi_buffer_get32(buf);
+    m->ph->mod_num = mobi_buffer_get32(buf);
+    m->ph->appinfo_offset = mobi_buffer_get32(buf);
+    m->ph->sortinfo_offset = mobi_buffer_get32(buf);
+    mobi_buffer_getstring(m->ph->type, buf, 4);
+    mobi_buffer_getstring(m->ph->creator, buf, 4);
+    m->ph->uid = mobi_buffer_get32(buf);
+    m->ph->next_rec = mobi_buffer_get32(buf);
+    m->ph->rec_count = mobi_buffer_get16(buf);
+    mobi_buffer_free(buf);
+    return MOBI_SUCCESS;
+}
+
+/**
+ @brief Read list of database records from file into MOBIData structure (MOBIPdbRecord)
+ 
+ @param[in,out] m MOBIData structure to be filled with read data
+ @param[in] file Filedescriptor to read from
+ @return MOBI_RET status code (on success MOBI_SUCCESS)
+ */
+MOBI_RET mobi_load_reclist(MOBIData *m, FILE *file) {
+    if (m == NULL) {
+        debug_print("%s", "Mobi structure not initialized\n");
+        return MOBI_INIT_FAILED;
+    }
+    if (!file) {
+        debug_print("%s", "File not ready\n");
+        return MOBI_FILE_NOT_FOUND;
+    }
+    m->rec = calloc(1, sizeof(MOBIPdbRecord));
+    if (m->rec == NULL) {
+        debug_print("%s", "Memory allocation for pdb record failed\n");
+        return MOBI_MALLOC_FAILED;
+    }
+    MOBIPdbRecord *curr = m->rec;
+    for (int i = 0; i < m->ph->rec_count; i++) {
+        MOBIBuffer *buf = mobi_buffer_init(PALMDB_RECORD_INFO_SIZE);
+        if (buf == NULL) {
+            debug_print("%s\n", "Memory allocation failed");
+            return MOBI_MALLOC_FAILED;
+        }
+        const size_t len = fread(buf->data, 1, PALMDB_RECORD_INFO_SIZE, file);
+        if (len != PALMDB_RECORD_INFO_SIZE) {
+            mobi_buffer_free(buf);
+            return MOBI_DATA_CORRUPT;
+        }
+        if (i > 0) {
+            curr->next = calloc(1, sizeof(MOBIPdbRecord));
+            if (curr->next == NULL) {
+                debug_print("%s", "Memory allocation for pdb record failed\n");
+                mobi_buffer_free(buf);
+                return MOBI_MALLOC_FAILED;
+            }
+            curr = curr->next;
+        }
+        curr->offset = mobi_buffer_get32(buf);
+        curr->attributes = mobi_buffer_get8(buf);
+        const uint8_t h = mobi_buffer_get8(buf);
+        const uint16_t l = mobi_buffer_get16(buf);
+        curr->uid =  (uint32_t) h << 16 | l;
+        curr->next = NULL;
+        mobi_buffer_free(buf);
+    }
+    return MOBI_SUCCESS;
+}
+
+/**
+ @brief Read record data and size from file into MOBIData structure (MOBIPdbRecord)
+ 
+ @param[in,out] m MOBIData structure to be filled with read data
+ @param[in] file Filedescriptor to read from
+ @return MOBI_RET status code (on success MOBI_SUCCESS)
+ */
+MOBI_RET mobi_load_rec(MOBIData *m, FILE *file) {
+    MOBI_RET ret;
+    if (m == NULL) {
+        debug_print("%s", "Mobi structure not initialized\n");
+        return MOBI_INIT_FAILED;
+    }
+    MOBIPdbRecord *curr = m->rec;
+    while (curr != NULL) {
+        MOBIPdbRecord *next;
+        size_t size;
+        if (curr->next != NULL) {
+            next = curr->next;
+            size = next->offset - curr->offset;
+        } else {
+            fseek(file, 0, SEEK_END);
+            long diff = ftell(file) - curr->offset;
+            if (diff <= 0) {
+                debug_print("Wrong record size: %li\n", diff);
+                return MOBI_DATA_CORRUPT;
+            }
+            size = (size_t) diff;
+            next = NULL;
+        }
+
+        curr->size = size;
+        ret = mobi_load_recdata(curr, file);
+        if (ret  != MOBI_SUCCESS) {
+            debug_print("Error loading record uid %i data\n", curr->uid);
+            mobi_free_rec(m);
+            return ret;
+        }
+        curr = next;
+    }
+    return MOBI_SUCCESS;
+}
+
+/**
+ @brief Read record data from file into MOBIPdbRecord structure
+ 
+ @param[in,out] rec MOBIPdbRecord structure to be filled with read data
+ @param[in] file Filedescriptor to read from
+ @return MOBI_RET status code (on success MOBI_SUCCESS)
+ */
+MOBI_RET mobi_load_recdata(MOBIPdbRecord *rec, FILE *file) {
+    const int ret = fseek(file, rec->offset, SEEK_SET);
+    if (ret != 0) {
+        debug_print("Record %i not found\n", rec->uid);
+        return MOBI_DATA_CORRUPT;
+    }
+    rec->data = malloc(rec->size);
+    if (rec->data == NULL) {
+        debug_print("%s", "Memory allocation for pdb record data failed\n");
+        return MOBI_MALLOC_FAILED;
+    }
+    const size_t len = fread(rec->data, 1, rec->size, file);
+    if (len < rec->size) {
+        debug_print("Truncated data in record %i\n", rec->uid);
+        return MOBI_DATA_CORRUPT;
+    }
+    return MOBI_SUCCESS;
+}
+
+/**
+ @brief Parse EXTH header from Record 0 into MOBIData structure (MOBIExthHeader)
+ 
+ @param[in,out] m MOBIData structure to be filled with parsed data
+ @param[in] buf MOBIBuffer buffer to read from
+ @return MOBI_RET status code (on success MOBI_SUCCESS)
+ */
+MOBI_RET mobi_parse_extheader(MOBIData *m, MOBIBuffer *buf) {
+    if (m == NULL) {
+        debug_print("%s", "Mobi structure not initialized\n");
+        return MOBI_INIT_FAILED;
+    }
+    char exth_magic[5];
+    const size_t header_length = 12;
+    mobi_buffer_getstring(exth_magic, buf, 4);
+    const size_t exth_length = mobi_buffer_get32(buf) - header_length;
+    const size_t rec_count = mobi_buffer_get32(buf);
+    if (strncmp(exth_magic, EXTH_MAGIC, 4) != 0 ||
+        exth_length + buf->offset > buf->maxlen ||
+        rec_count == 0 || rec_count > MOBI_EXTH_MAXCNT) {
+        debug_print("%s", "Sanity checks for EXTH header failed\n");
+        return MOBI_DATA_CORRUPT;
+    }
+    const size_t saved_maxlen = buf->maxlen;
+    buf->maxlen = exth_length + buf->offset;
+    m->eh = calloc(1, sizeof(MOBIExthHeader));
+    if (m->eh == NULL) {
+        debug_print("%s", "Memory allocation for EXTH header failed\n");
+        return MOBI_MALLOC_FAILED;
+    }
+    MOBIExthHeader *curr = m->eh;
+    for (size_t i = 0; i < rec_count; i++) {
+        if (curr->data) {
+            curr->next = calloc(1, sizeof(MOBIExthHeader));
+            if (curr->next == NULL) {
+                debug_print("%s", "Memory allocation for EXTH header failed\n");
+                mobi_free_eh(m);
+                return MOBI_MALLOC_FAILED;
+            }
+            curr = curr->next;
+        }
+        curr->tag = mobi_buffer_get32(buf);
+        /* data size = record size minus 8 bytes for uid and size */
+        curr->size = mobi_buffer_get32(buf) - 8;
+        if (curr->size == 0) {
+            debug_print("Skip record %i, data too short\n", curr->tag);
+            continue;
+        }
+        if (buf->offset + curr->size > buf->maxlen) {
+            debug_print("Record %i too long\n", curr->tag);
+            mobi_free_eh(m);
+            return MOBI_DATA_CORRUPT;
+        }
+        curr->data = malloc(curr->size);
+        if (curr->data == NULL) {
+            debug_print("Memory allocation for EXTH record %i failed\n", curr->tag);
+            mobi_free_eh(m);
+            return MOBI_MALLOC_FAILED;
+        }
+        mobi_buffer_getraw(curr->data, buf, curr->size);
+        curr->next = NULL;
+    }    
+    buf->maxlen = saved_maxlen;
+    return MOBI_SUCCESS;
+}
+
+/**
+ @brief Parse MOBI header from Record 0 into MOBIData structure (MOBIMobiHeader)
+ 
+ @param[in,out] m MOBIData structure to be filled with parsed data
+ @param[in] buf MOBIBuffer buffer to read from
+ @return MOBI_RET status code (on success MOBI_SUCCESS)
+ */
+MOBI_RET mobi_parse_mobiheader(MOBIData *m, MOBIBuffer *buf) {
+    int isKF8 = 0;
+    if (m == NULL) {
+        debug_print("%s", "Mobi structure not initialized\n");
+        return MOBI_INIT_FAILED;
+    }
+    m->mh = calloc(1, sizeof(MOBIMobiHeader));
+    if (m->mh == NULL) {
+        debug_print("%s", "Memory allocation for MOBI header failed\n");
+        return MOBI_MALLOC_FAILED;
+    }
+    mobi_buffer_getstring(m->mh->mobi_magic, buf, 4);
+    mobi_buffer_dup32(&m->mh->header_length, buf);
+    if (strcmp(m->mh->mobi_magic, MOBI_MAGIC) != 0 || m->mh->header_length == NULL) {
+        debug_print("%s", "MOBI header not found\n");
+        mobi_free_mh(m->mh);
+        m->mh = NULL;
+        return MOBI_DATA_CORRUPT;
+    }
+    const size_t saved_maxlen = buf->maxlen;
+    /* some old files declare zero length mobi header, try to read first 24 bytes anyway */
+    uint32_t header_length = (*m->mh->header_length > 0) ? *m->mh->header_length : 24;
+    /* read only declared MOBI header length (curr offset minus 8 already read bytes) */
+    const size_t left_length = header_length + buf->offset - 8;
+    buf->maxlen = saved_maxlen < left_length ? saved_maxlen : left_length;
+    mobi_buffer_dup32(&m->mh->mobi_type, buf);
+    uint32_t encoding = mobi_buffer_get32(buf);
+    if (encoding == 1252) {
+        m->mh->text_encoding = malloc(sizeof(MOBIEncoding));
+        if (m->mh->text_encoding == NULL) {
+            debug_print("%s", "Memory allocation for MOBI header failed\n");
+            return MOBI_MALLOC_FAILED;
+        }
+        *m->mh->text_encoding = MOBI_CP1252;
+    }
+    else if (encoding == 65001) {
+        m->mh->text_encoding = malloc(sizeof(MOBIEncoding));
+        if (m->mh->text_encoding == NULL) {
+            debug_print("%s", "Memory allocation for MOBI header failed\n");
+            return MOBI_MALLOC_FAILED;
+        }
+        *m->mh->text_encoding = MOBI_UTF8;
+    } else {
+        debug_print("Unknown encoding in mobi header: %i\n", encoding);
+    }
+    mobi_buffer_dup32(&m->mh->uid, buf);
+    mobi_buffer_dup32(&m->mh->version, buf);
+    if (header_length >= MOBI_HEADER_V7_SIZE
+        && m->mh->version && *m->mh->version == 8) {
+        isKF8 = 1;
+    }
+    mobi_buffer_dup32(&m->mh->orth_index, buf);
+    mobi_buffer_dup32(&m->mh->infl_index, buf);
+    mobi_buffer_dup32(&m->mh->names_index, buf);
+    mobi_buffer_dup32(&m->mh->keys_index, buf);
+    mobi_buffer_dup32(&m->mh->extra0_index, buf);
+    mobi_buffer_dup32(&m->mh->extra1_index, buf);
+    mobi_buffer_dup32(&m->mh->extra2_index, buf);
+    mobi_buffer_dup32(&m->mh->extra3_index, buf);
+    mobi_buffer_dup32(&m->mh->extra4_index, buf);
+    mobi_buffer_dup32(&m->mh->extra5_index, buf);
+    mobi_buffer_dup32(&m->mh->non_text_index, buf);
+    mobi_buffer_dup32(&m->mh->full_name_offset, buf);
+    mobi_buffer_dup32(&m->mh->full_name_length, buf);
+    mobi_buffer_dup32(&m->mh->locale, buf);
+    mobi_buffer_dup32(&m->mh->dict_input_lang, buf);
+    mobi_buffer_dup32(&m->mh->dict_output_lang, buf);
+    mobi_buffer_dup32(&m->mh->min_version, buf);
+    mobi_buffer_dup32(&m->mh->image_index, buf);
+    mobi_buffer_dup32(&m->mh->huff_rec_index, buf);
+    mobi_buffer_dup32(&m->mh->huff_rec_count, buf);
+    mobi_buffer_dup32(&m->mh->datp_rec_index, buf);
+    mobi_buffer_dup32(&m->mh->datp_rec_count, buf);
+    mobi_buffer_dup32(&m->mh->exth_flags, buf);
+    mobi_buffer_seek(buf, 32); /* 32 unknown bytes */
+    mobi_buffer_dup32(&m->mh->unknown6, buf);
+    mobi_buffer_dup32(&m->mh->drm_offset, buf);
+    mobi_buffer_dup32(&m->mh->drm_count, buf);
+    mobi_buffer_dup32(&m->mh->drm_size, buf);
+    mobi_buffer_dup32(&m->mh->drm_flags, buf);
+    mobi_buffer_seek(buf, 8); /* 8 unknown bytes */
+    if (isKF8) {
+        mobi_buffer_dup32(&m->mh->fdst_index, buf);
+    } else {
+        mobi_buffer_dup16(&m->mh->first_text_index, buf);
+        mobi_buffer_dup16(&m->mh->last_text_index, buf);
+    }
+    mobi_buffer_dup32(&m->mh->fdst_section_count, buf);
+    mobi_buffer_dup32(&m->mh->fcis_index, buf);
+    mobi_buffer_dup32(&m->mh->fcis_count, buf);
+    mobi_buffer_dup32(&m->mh->flis_index, buf);
+    mobi_buffer_dup32(&m->mh->flis_count, buf);
+    mobi_buffer_dup32(&m->mh->unknown10, buf);
+    mobi_buffer_dup32(&m->mh->unknown11, buf);
+    mobi_buffer_dup32(&m->mh->srcs_index, buf);
+    mobi_buffer_dup32(&m->mh->srcs_count, buf);
+    mobi_buffer_dup32(&m->mh->unknown12, buf);
+    mobi_buffer_dup32(&m->mh->unknown13, buf);
+    mobi_buffer_seek(buf, 2); /* 2 byte fill */
+    mobi_buffer_dup16(&m->mh->extra_flags, buf);
+    mobi_buffer_dup32(&m->mh->ncx_index, buf);
+    if (isKF8) {
+        mobi_buffer_dup32(&m->mh->fragment_index, buf);
+        mobi_buffer_dup32(&m->mh->skeleton_index, buf);
+    } else {
+        mobi_buffer_dup32(&m->mh->unknown14, buf);
+        mobi_buffer_dup32(&m->mh->unknown15, buf);
+    }
+    mobi_buffer_dup32(&m->mh->datp_index, buf);
+    if (isKF8) {
+        mobi_buffer_dup32(&m->mh->guide_index, buf);
+    } else {
+        mobi_buffer_dup32(&m->mh->unknown16, buf);
+    }
+    mobi_buffer_dup32(&m->mh->unknown17, buf);
+    mobi_buffer_dup32(&m->mh->unknown18, buf);
+    mobi_buffer_dup32(&m->mh->unknown19, buf);
+    mobi_buffer_dup32(&m->mh->unknown20, buf);
+    if (buf->maxlen > buf->offset) {
+        debug_print("Skipping %zu unknown bytes in MOBI header\n", (buf->maxlen - buf->offset));
+        mobi_buffer_setpos(buf, buf->maxlen);
+    }
+    buf->maxlen = saved_maxlen;
+    /* get full name stored at m->mh->full_name_offset */
+    if (m->mh->full_name_offset && m->mh->full_name_length) {
+        const size_t saved_offset = buf->offset;
+        const uint32_t full_name_length = min(*m->mh->full_name_length, MOBI_TITLE_SIZEMAX);
+        mobi_buffer_setpos(buf, *m->mh->full_name_offset);
+        m->mh->full_name = malloc(full_name_length + 1);
+        if (m->mh->full_name == NULL) {
+            debug_print("%s", "Memory allocation for full name failed\n");
+            return MOBI_MALLOC_FAILED;
+        }
+        if (full_name_length) {
+            mobi_buffer_getstring(m->mh->full_name, buf, full_name_length);
+        } else {
+            m->mh->full_name[0] = '\0';
+        }
+        mobi_buffer_setpos(buf, saved_offset);
+    }
+    return MOBI_SUCCESS;
+}
+
+/**
+ @brief Parse Record 0 into MOBIData structure
+ 
+ This function will parse MOBIRecord0Header, MOBIMobiHeader and MOBIExthHeader
+ 
+ @param[in,out] m MOBIData structure to be filled with parsed data
+ @param[in] seqnumber Sequential number of the palm database record
+ @return MOBI_RET status code (on success MOBI_SUCCESS)
+ */
+MOBI_RET mobi_parse_record0(MOBIData *m, const size_t seqnumber) {
+    MOBI_RET ret;
+    if (m == NULL) {
+        debug_print("%s", "Mobi structure not initialized\n");
+        return MOBI_INIT_FAILED;
+    }
+    const MOBIPdbRecord *record0 = mobi_get_record_by_seqnumber(m, seqnumber);
+    if (record0 == NULL) {
+        debug_print("%s", "Record 0 not loaded\n");
+        return MOBI_DATA_CORRUPT;
+    }
+    if (record0->size < RECORD0_HEADER_LEN) {
+        debug_print("%s", "Record 0 too short\n");
+        return MOBI_DATA_CORRUPT;
+    }
+    MOBIBuffer *buf = mobi_buffer_init_null(record0->data, record0->size);
+    if (buf == NULL) {
+        debug_print("%s\n", "Memory allocation failed");
+        return MOBI_MALLOC_FAILED;
+    }
+    m->rh = calloc(1, sizeof(MOBIRecord0Header));
+    if (m->rh == NULL) {
+        debug_print("%s", "Memory allocation for record 0 header failed\n");
+        mobi_buffer_free_null(buf);
+        return MOBI_MALLOC_FAILED;
+    }
+    /* parse palmdoc header */
+    const uint16_t compression = mobi_buffer_get16(buf);
+    mobi_buffer_seek(buf, 2); // unused 2 bytes, zeroes
+    if ((compression != MOBI_COMPRESSION_NONE &&
+         compression != MOBI_COMPRESSION_PALMDOC &&
+         compression != MOBI_COMPRESSION_HUFFCDIC)) {
+        debug_print("Wrong record0 header: %c%c%c%c\n", record0->data[0], record0->data[1], record0->data[2], record0->data[3]);
+        mobi_buffer_free_null(buf);
+        free(m->rh);
+        m->rh = NULL;
+        return MOBI_DATA_CORRUPT;
+    }
+    m->rh->compression_type = compression;
+    m->rh->text_length = mobi_buffer_get32(buf);
+    m->rh->text_record_count = mobi_buffer_get16(buf);
+    m->rh->text_record_size = mobi_buffer_get16(buf);
+    m->rh->encryption_type = mobi_buffer_get16(buf);
+    m->rh->unknown1 = mobi_buffer_get16(buf);
+    if (mobi_is_mobipocket(m)) {
+        /* parse mobi header if present  */
+        ret = mobi_parse_mobiheader(m, buf);
+        if (ret == MOBI_SUCCESS) {
+            /* parse exth header if present */
+            mobi_parse_extheader(m, buf);
+        }
+    } 
+    mobi_buffer_free_null(buf);
+    return MOBI_SUCCESS;
+}
+
+/**
+ @brief Calculate the size of extra bytes at the end of text record
+ 
+ @param[in] record MOBIPdbRecord structure containing the record
+ @param[in] flags Flags from MOBI header (extra_flags)
+ @return The size of trailing bytes, MOBI_NOTSET on failure
+ */
+size_t mobi_get_record_extrasize(const MOBIPdbRecord *record, const uint16_t flags) {
+    size_t extra_size = 0;
+    MOBIBuffer *buf = mobi_buffer_init_null(record->data, record->size);
+    if (buf == NULL) {
+        debug_print("%s", "Buffer init in extrasize failed\n");
+        return MOBI_NOTSET;
+    }
+    /* set pointer at the end of the record data */
+    mobi_buffer_setpos(buf, buf->maxlen - 1);
+    for (int bit = 15; bit > 0; bit--) {
+        if (flags & (1 << bit)) {
+            /* bit is set */
+            size_t len = 0;
+            /* size contains varlen itself and optional data */
+            const uint32_t size = mobi_buffer_get_varlen_dec(buf, &len);
+            /* skip data */
+            /* TODO: read and store in record struct */
+            mobi_buffer_seek(buf, - (int)(size - len));
+            extra_size += size;
+        }
+    }
+    /* check bit 0 */
+    if (flags & 1) {
+            const uint8_t b = mobi_buffer_get8(buf);
+            /* two first bits hold size */
+            extra_size += (b & 0x3) + 1;
+    }
+    mobi_buffer_free_null(buf);
+    return extra_size;
+}
+
+/**
+ @brief Calculate the size of extra multibyte section at the end of text record
+ 
+ @param[in] record MOBIPdbRecord structure containing the record
+ @param[in] flags Flags from MOBI header (extra_flags)
+ @return The size of trailing bytes, MOBI_NOTSET on failure
+ */
+size_t mobi_get_record_mb_extrasize(const MOBIPdbRecord *record, const uint16_t flags) {
+    size_t extra_size = 0;
+    if (flags & 1) {
+        MOBIBuffer *buf = mobi_buffer_init_null(record->data, record->size);
+        if (buf == NULL) {
+            debug_print("%s", "Buffer init in extrasize failed\n");
+            return MOBI_NOTSET;
+        }
+        /* set pointer at the end of the record data */
+        mobi_buffer_setpos(buf, buf->maxlen - 1);
+        for (int bit = 15; bit > 0; bit--) {
+            if (flags & (1 << bit)) {
+                /* bit is set */
+                size_t len = 0;
+                /* size contains varlen itself and optional data */
+                const uint32_t size = mobi_buffer_get_varlen_dec(buf, &len);
+                /* skip data */
+                /* TODO: read and store in record struct */
+                mobi_buffer_seek(buf, - (int)(size - len));
+            }
+        }
+        /* read multibyte section */
+        const uint8_t b = mobi_buffer_get8(buf);
+        /* two first bits hold size */
+        extra_size += (b & 0x3) + 1;
+        mobi_buffer_free_null(buf);
+    }
+    return extra_size;
+}
+
+/**
+ @brief Parse HUFF record into MOBIHuffCdic structure
+ 
+ @param[in,out] huffcdic MOBIHuffCdic structure to be filled with parsed data
+ @param[in] record MOBIPdbRecord structure containing the record
+ @return MOBI_RET status code (on success MOBI_SUCCESS)
+ */
+MOBI_RET mobi_parse_huff(MOBIHuffCdic *huffcdic, const MOBIPdbRecord *record) {
+    MOBIBuffer *buf = mobi_buffer_init_null(record->data, record->size);
+    if (buf == NULL) {
+        debug_print("%s\n", "Memory allocation failed");
+        return MOBI_MALLOC_FAILED;
+    }
+    char huff_magic[5];
+    mobi_buffer_getstring(huff_magic, buf, 4);
+    const size_t header_length = mobi_buffer_get32(buf);
+    if (strncmp(huff_magic, HUFF_MAGIC, 4) != 0 || header_length < HUFF_HEADER_LEN) {
+        debug_print("HUFF wrong magic: %s\n", huff_magic);
+        mobi_buffer_free_null(buf);
+        return MOBI_DATA_CORRUPT;
+    }
+    const size_t data1_offset = mobi_buffer_get32(buf);
+    const size_t data2_offset = mobi_buffer_get32(buf);
+    /* skip little-endian table offsets */
+    mobi_buffer_setpos(buf, data1_offset);
+    if (buf->offset + (256 * 4) > buf->maxlen) {
+        debug_print("%s", "HUFF data1 too short\n");
+        mobi_buffer_free_null(buf);
+        return MOBI_DATA_CORRUPT;
+    }
+    /* read 256 indices from data1 big-endian */
+    for (int i = 0; i < 256; i++) {
+        huffcdic->table1[i] = mobi_buffer_get32(buf);
+    }
+    mobi_buffer_setpos(buf, data2_offset);
+    if (buf->offset + (64 * 4) > buf->maxlen) {
+        debug_print("%s", "HUFF data2 too short\n");
+        mobi_buffer_free_null(buf);
+        return MOBI_DATA_CORRUPT;
+    }
+    /* read 32 mincode-maxcode pairs from data2 big-endian */
+    huffcdic->mincode_table[0] = 0;
+    huffcdic->maxcode_table[0] = 0xFFFFFFFF;
+    for (int i = 1; i < HUFF_CODETABLE_SIZE; i++) {
+        const uint32_t mincode = mobi_buffer_get32(buf);
+        const uint32_t maxcode = mobi_buffer_get32(buf);
+        huffcdic->mincode_table[i] =  mincode << (32 - i);
+        huffcdic->maxcode_table[i] =  ((maxcode + 1) << (32 - i)) - 1;
+    }
+    mobi_buffer_free_null(buf);
+    return MOBI_SUCCESS;
+}
+
+/**
+ @brief Parse CDIC record into MOBIHuffCdic structure
+ 
+ @param[in,out] huffcdic MOBIHuffCdic structure to be filled with parsed data
+ @param[in] record MOBIPdbRecord structure containing the record
+ @param[in] num Number of CDIC record in a set, starting from zero
+ @return MOBI_RET status code (on success MOBI_SUCCESS)
+ */
+MOBI_RET mobi_parse_cdic(MOBIHuffCdic *huffcdic, const MOBIPdbRecord *record, const size_t num) {
+    MOBIBuffer *buf = mobi_buffer_init_null(record->data, record->size);
+    if (buf == NULL) {
+        debug_print("%s\n", "Memory allocation failed");
+        return MOBI_MALLOC_FAILED;
+    }
+    char cdic_magic[5];
+    mobi_buffer_getstring(cdic_magic, buf, 4);
+    const size_t header_length = mobi_buffer_get32(buf);
+    if (strncmp(cdic_magic, CDIC_MAGIC, 4) != 0 || header_length < CDIC_HEADER_LEN) {
+        debug_print("CDIC wrong magic: %s or declared header length: %zu\n", cdic_magic, header_length);
+        mobi_buffer_free_null(buf);
+        return MOBI_DATA_CORRUPT;
+    }
+    /* variables in huffcdic initialized to zero with calloc */
+    /* save initial count and length */
+    size_t index_count = mobi_buffer_get32(buf);
+    const size_t code_length = mobi_buffer_get32(buf);
+    if (huffcdic->code_length && huffcdic->code_length != code_length) {
+        debug_print("CDIC different code length %zu in record %i, previous was %zu\n", huffcdic->code_length, record->uid, code_length);
+        mobi_buffer_free_null(buf);
+        return MOBI_DATA_CORRUPT;
+    }
+    if (huffcdic->index_count && huffcdic->index_count != index_count) {
+        debug_print("CDIC different index count %zu in record %i, previous was %zu\n", huffcdic->index_count, record->uid, index_count);
+        mobi_buffer_free_null(buf);
+        return MOBI_DATA_CORRUPT;
+    }
+    if (code_length == 0 || code_length > HUFF_CODELEN_MAX) {
+        debug_print("Code length exceeds sanity checks (%zu)\n", code_length);
+        mobi_buffer_free_null(buf);
+        return MOBI_DATA_CORRUPT;
+    }
+    huffcdic->code_length = code_length;
+    huffcdic->index_count = index_count;
+    if (index_count == 0) {
+        debug_print("%s", "CDIC index count is null");
+        mobi_buffer_free_null(buf);
+        return MOBI_DATA_CORRUPT;
+    }
+    /* allocate memory for symbol offsets if not already allocated */
+    if (num == 0) {
+        if (index_count > (1 << HUFF_CODELEN_MAX) * CDIC_RECORD_MAXCNT) {
+            debug_print("CDIC index count too large %zu\n", index_count);
+            mobi_buffer_free_null(buf);
+            return MOBI_DATA_CORRUPT;
+        }
+        huffcdic->symbol_offsets = malloc(index_count * sizeof(*huffcdic->symbol_offsets));
+        if (huffcdic->symbol_offsets == NULL) {
+            debug_print("%s", "CDIC cannot allocate memory");
+            mobi_buffer_free_null(buf);
+            return MOBI_MALLOC_FAILED;
+        }
+    }
+    index_count -= huffcdic->index_read;
+    /* limit number of records read to code_length bits */
+    if (index_count >> code_length) {
+        index_count = (1 << code_length);
+    }
+    if (buf->offset + (index_count * 2) > buf->maxlen) {
+        debug_print("%s", "CDIC indices data too short\n");
+        mobi_buffer_free_null(buf);
+        return MOBI_DATA_CORRUPT;
+    }
+    /* read i * 2 byte big-endian indices */
+    while (index_count--) {
+        const uint16_t offset = mobi_buffer_get16(buf);
+        const size_t saved_pos = buf->offset;
+        mobi_buffer_setpos(buf, offset + CDIC_HEADER_LEN);
+        const size_t len = mobi_buffer_get16(buf) & 0x7fff;
+        if (buf->error != MOBI_SUCCESS || buf->offset + len > buf->maxlen) {
+            debug_print("%s", "CDIC offset beyond buffer\n");
+            mobi_buffer_free_null(buf);
+            return MOBI_DATA_CORRUPT;
+        }
+        mobi_buffer_setpos(buf, saved_pos);
+        huffcdic->symbol_offsets[huffcdic->index_read++] = offset;
+    }
+    if (buf->offset + code_length > buf->maxlen) {
+        debug_print("%s", "CDIC dictionary data too short\n");
+        mobi_buffer_free_null(buf);
+        return MOBI_DATA_CORRUPT;
+    }
+    /* copy pointer to data */
+    huffcdic->symbols[num] = record->data + CDIC_HEADER_LEN;
+    /* free buffer */
+    mobi_buffer_free_null(buf);
+    return MOBI_SUCCESS;
+}
+
+/**
+ @brief Parse a set of HUFF and CDIC records into MOBIHuffCdic structure
+ 
+ @param[in] m MOBIData structure with loaded MOBI document
+ @param[in,out] huffcdic MOBIHuffCdic structure to be filled with parsed data
+ @return MOBI_RET status code (on success MOBI_SUCCESS)
+ */
+MOBI_RET mobi_parse_huffdic(const MOBIData *m, MOBIHuffCdic *huffcdic) {
+    MOBI_RET ret;
+    const size_t offset = mobi_get_kf8offset(m);
+    if (m->mh == NULL || m->mh->huff_rec_index == NULL || m->mh->huff_rec_count == NULL) {
+        debug_print("%s", "HUFF/CDIC records metadata not found in MOBI header\n");
+        return MOBI_DATA_CORRUPT;
+    }
+    const size_t huff_rec_index = *m->mh->huff_rec_index + offset;
+    const size_t huff_rec_count = *m->mh->huff_rec_count;
+    if (huff_rec_count > HUFF_RECORD_MAXCNT) {
+        debug_print("Too many HUFF record (%zu)\n", huff_rec_count);
+        return MOBI_DATA_CORRUPT;
+    }
+    const MOBIPdbRecord *curr = mobi_get_record_by_seqnumber(m, huff_rec_index);
+    if (curr == NULL || huff_rec_count < 2) {
+        debug_print("%s", "HUFF/CDIC record not found\n");
+        return MOBI_DATA_CORRUPT;
+    }
+    if (curr->size < HUFF_RECORD_MINSIZE) {
+        debug_print("HUFF record too short (%zu b)\n", curr->size);
+        return MOBI_DATA_CORRUPT;
+    }
+    ret = mobi_parse_huff(huffcdic, curr);
+    if (ret != MOBI_SUCCESS) {
+        debug_print("%s", "HUFF parsing failed\n");
+        return ret;
+    }
+    curr = curr->next;
+    /* allocate memory for symbols data in each CDIC record */
+    huffcdic->symbols = malloc((huff_rec_count - 1) * sizeof(*huffcdic->symbols));
+    if (huffcdic->symbols == NULL) {
+        debug_print("%s\n", "Memory allocation failed");
+        return MOBI_MALLOC_FAILED;
+    }
+    /* get following CDIC records */
+    size_t i = 0;
+    while (i < huff_rec_count - 1) {
+        if (curr == NULL) {
+            debug_print("%s\n", "CDIC record not found");
+            return MOBI_DATA_CORRUPT;
+        }
+        ret = mobi_parse_cdic(huffcdic, curr, i++);
+        if (ret != MOBI_SUCCESS) {
+            debug_print("%s", "CDIC parsing failed\n");
+            return ret;
+        }
+        curr = curr->next;
+    }
+    if (huffcdic->index_count != huffcdic->index_read) {
+        debug_print("CDIC: wrong read index count: %zu, total: %zu\n", huffcdic->index_read, huffcdic->index_count);
+        return MOBI_DATA_CORRUPT;
+    }
+    return MOBI_SUCCESS;
+}
+
+/**
+ @brief Parse FDST record into MOBIRawml structure (MOBIFdst member)
+ 
+ @param[in] m MOBIData structure with loaded MOBI document
+ @param[in,out] rawml MOBIRawml structure to be filled with parsed data
+ @return MOBI_RET status code (on success MOBI_SUCCESS)
+ */
+MOBI_RET mobi_parse_fdst(const MOBIData *m, MOBIRawml *rawml) {
+    if (m == NULL) {
+        debug_print("%s", "Mobi structure not initialized\n");
+        return MOBI_INIT_FAILED;
+    }
+    const size_t fdst_record_number = mobi_get_fdst_record_number(m);
+    if (fdst_record_number == MOBI_NOTSET) {
+        return MOBI_DATA_CORRUPT;
+    }
+    const MOBIPdbRecord *fdst_record = mobi_get_record_by_seqnumber(m, fdst_record_number);
+    if (fdst_record == NULL) {
+        return MOBI_DATA_CORRUPT;
+    }
+    MOBIBuffer *buf = mobi_buffer_init_null(fdst_record->data, fdst_record->size);
+    if (buf == NULL) {
+        debug_print("%s\n", "Memory allocation failed");
+        return MOBI_MALLOC_FAILED;
+    }
+    char fdst_magic[5];
+    mobi_buffer_getstring(fdst_magic, buf, 4);
+    const size_t data_offset = mobi_buffer_get32(buf);
+    const size_t section_count = mobi_buffer_get32(buf);
+    if (strncmp(fdst_magic, FDST_MAGIC, 4) != 0 ||
+        section_count <= 1 ||
+        section_count != *m->mh->fdst_section_count ||
+        data_offset != 12) {
+        debug_print("FDST wrong magic: %s, sections count: %zu or data offset: %zu\n", fdst_magic, section_count, data_offset);
+        mobi_buffer_free_null(buf);
+        return MOBI_DATA_CORRUPT;
+    }
+    if ((buf->maxlen - buf->offset) < section_count * 8) {
+        debug_print("%s", "Record FDST too short\n");
+        mobi_buffer_free_null(buf);
+        return MOBI_DATA_CORRUPT;
+    }
+    rawml->fdst = malloc(sizeof(MOBIFdst));
+    if (rawml->fdst == NULL) {
+        debug_print("%s\n", "Memory allocation failed");
+        mobi_buffer_free_null(buf);
+        return MOBI_MALLOC_FAILED;
+    }
+    rawml->fdst->fdst_section_count = section_count;
+    rawml->fdst->fdst_section_starts = malloc(sizeof(*rawml->fdst->fdst_section_starts) * section_count);
+    if (rawml->fdst->fdst_section_starts == NULL) {
+        debug_print("%s\n", "Memory allocation failed");
+        mobi_buffer_free_null(buf);
+        free(rawml->fdst);
+        rawml->fdst = NULL;
+        return MOBI_MALLOC_FAILED;
+    }
+    rawml->fdst->fdst_section_ends = malloc(sizeof(*rawml->fdst->fdst_section_ends) * section_count);
+    if (rawml->fdst->fdst_section_ends == NULL) {
+        debug_print("%s\n", "Memory allocation failed");
+        mobi_buffer_free_null(buf);
+        free(rawml->fdst->fdst_section_starts);
+        free(rawml->fdst);
+        rawml->fdst = NULL;
+        return MOBI_MALLOC_FAILED;
+    }
+    size_t i = 0;
+    while (i < section_count) {
+        rawml->fdst->fdst_section_starts[i] = mobi_buffer_get32(buf);
+        rawml->fdst->fdst_section_ends[i] = mobi_buffer_get32(buf);
+        debug_print("FDST[%zu]:\t%i\t%i\n", i, rawml->fdst->fdst_section_starts[i], rawml->fdst->fdst_section_ends[i]);
+        i++;
+    }
+    mobi_buffer_free_null(buf);
+    return MOBI_SUCCESS;
+}
+
+/**
+ @brief Read MOBI document from file into MOBIData structure
+ 
+ @param[in,out] m MOBIData structure to be filled with read data
+ @param[in] file File descriptor to read from
+ @return MOBI_RET status code (on success MOBI_SUCCESS)
+ */
+MOBI_RET mobi_load_file(MOBIData *m, FILE *file) {
+    MOBI_RET ret;
+    if (m == NULL) {
+        debug_print("%s", "Mobi structure not initialized\n");
+        return MOBI_INIT_FAILED;
+    }
+    ret = mobi_load_pdbheader(m, file);
+    if (ret != MOBI_SUCCESS) {
+        return ret;
+    }
+    if (strcmp(m->ph->type, "BOOK") != 0 && strcmp(m->ph->type, "TEXt") != 0) {
+        debug_print("Unsupported file type: %s\n", m->ph->type);
+        return MOBI_FILE_UNSUPPORTED;
+    }
+    if (m->ph->rec_count == 0) {
+        debug_print("%s", "No records found\n");
+        return MOBI_DATA_CORRUPT;
+    }
+    ret = mobi_load_reclist(m, file);
+    if (ret != MOBI_SUCCESS) {
+        return ret;
+    }
+    ret = mobi_load_rec(m, file);
+    if (ret != MOBI_SUCCESS) {
+        return ret;
+    }
+    ret = mobi_parse_record0(m, 0);
+    if (ret != MOBI_SUCCESS) {
+        return ret;
+    }
+    if (m->rh && m->rh->encryption_type == MOBI_ENCRYPTION_V1) {
+        /* try to set key for encryption type 1 */
+        debug_print("Trying to set key for encryption type 1%s", "\n");
+        mobi_drm_setkey(m, NULL);
+    }
+    /* if EXTH is loaded parse KF8 record0 for hybrid KF7/KF8 file */
+    if (m->eh) {
+        const size_t boundary_rec_number = mobi_get_kf8boundary_seqnumber(m);
+        if (boundary_rec_number != MOBI_NOTSET && boundary_rec_number < UINT32_MAX) {
+            /* it is a hybrid KF7/KF8 file */
+            m->kf8_boundary_offset = (uint32_t) boundary_rec_number;
+            m->next = mobi_init();
+            /* link pdb header and records data to KF8data structure */
+            m->next->ph = m->ph;
+            m->next->rec = m->rec;
+            m->next->drm_key = m->drm_key;
+            m->next->internals = m->internals;
+            /* close next loop */
+            m->next->next = m;
+            ret = mobi_parse_record0(m->next, boundary_rec_number + 1);
+            if (ret != MOBI_SUCCESS) {
+                return ret;
+            }
+            /* swap to kf8 part if use_kf8 flag is set */
+            if (m->use_kf8) {
+                mobi_swap_mobidata(m);
+            }
+        }
+    }
+    return MOBI_SUCCESS;
+}
+
+/**
+ @brief Read MOBI document from a path into MOBIData structure
+ 
+ @param[in,out] m MOBIData structure to be filled with read data
+ @param[in] path Path to a MOBI document on disk (eg. /home/me/test.mobi)
+ @return MOBI_RET status code (on success MOBI_SUCCESS)
+ */
+MOBI_RET mobi_load_filename(MOBIData *m, const char *path) {
+    FILE *file = fopen(path, "rb");
+    if (file == NULL) {
+        debug_print("%s", "File not found\n");
+        return MOBI_FILE_NOT_FOUND;
+    }
+    const MOBI_RET ret = mobi_load_file(m, file);
+    fclose(file);
+    return ret;
+}

app/src/main/cpp/libmobi/src/read.h

@@ -0,0 +1,28 @@
+/** @file read.h
+ *
+ * Copyright (c) 2014 Bartek Fabiszewski
+ * http://www.fabiszewski.net
+ *
+ * This file is part of libmobi.
+ * Licensed under LGPL, either version 3, or any later.
+ * See <http://www.gnu.org/licenses/>
+ */
+
+#ifndef libmobi_read_h
+#define libmobi_read_h
+
+#include "config.h"
+#include "mobi.h"
+#include "memory.h"
+#include "compression.h"
+
+#define MOBI_EXTH_MAXCNT 1024
+
+MOBI_RET mobi_parse_fdst(const MOBIData *m, MOBIRawml *rawml);
+MOBI_RET mobi_parse_huffdic(const MOBIData *m, MOBIHuffCdic *cdic);
+MOBI_RET mobi_load_pdbheader(MOBIData *m, FILE *file);
+MOBI_RET mobi_load_reclist(MOBIData *m, FILE *file);
+MOBI_RET mobi_load_rec(MOBIData *m, FILE *file);
+MOBI_RET mobi_load_recdata(MOBIPdbRecord *rec, FILE *file);
+
+#endif

app/src/main/cpp/libmobi/src/sha1.c

@@ -0,0 +1,281 @@
+/*
+ SHA-1 in C
+ By Steve Reid <sreid@sea-to-sky.net>
+ 100% Public Domain
+ -----------------
+ Modified 7/98
+ By James H. Brown <jbrown@burgoyne.com>
+ Still 100% Public Domain
+ Corrected a problem which generated improper hash values on 16 bit machines
+ Routine SHA1Update changed from
+ void SHA1Update(SHA1_CTX* context, unsigned char* data, unsigned int
+ len)
+ to
+ void SHA1Update(SHA1_CTX* context, unsigned char* data, unsigned
+ long len)
+ The 'len' parameter was declared an int which works fine on 32 bit machines.
+ However, on 16 bit machines an int is too small for the shifts being done
+ against
+ it.  This caused the hash function to generate incorrect values if len was
+ greater than 8191 (8K - 1) due to the 'len << 3' on line 3 of SHA1Update().
+ Since the file IO in main() reads 16K at a time, any file 8K or larger would
+ be guaranteed to generate the wrong hash (e.g. Test Vector #3, a million
+ "a"s).
+ I also changed the declaration of variables i & j in SHA1Update to
+ unsigned long from unsigned int for the same reason.
+ These changes should make no difference to any 32 bit implementations since
+ an
+ int and a long are the same size in those environments.
+ --
+ I also corrected a few compiler warnings generated by Borland C.
+ 1. Added #include <process.h> for exit() prototype
+ 2. Removed unused variable 'j' in SHA1Final
+ 3. Changed exit(0) to return(0) at end of main.
+ ALL changes I made can be located by searching for comments containing 'JHB'
+ -----------------
+ Modified 8/98
+ By Steve Reid <sreid@sea-to-sky.net>
+ Still 100% public domain
+ 1- Removed #include <process.h> and used return() instead of exit()
+ 2- Fixed overwriting of finalcount in SHA1Final() (discovered by Chris Hall)
+ 3- Changed email address from steve@edmweb.com to sreid@sea-to-sky.net
+ -----------------
+ Modified 4/01
+ By Saul Kravitz <Saul.Kravitz@celera.com>
+ Still 100% PD
+ Modified to run on Compaq Alpha hardware.
+ -----------------
+ Modified 07/2002
+ By Ralph Giles <giles@ghostscript.com>
+ Still 100% public domain
+ modified for use with stdint types, autoconf
+ code cleanup, removed attribution comments
+ switched SHA1Final() argument order for consistency
+ use SHA1_ prefix for public api
+ move public api to sha1.h
+ */
+
+/*
+ Test Vectors (from FIPS PUB 180-1)
+ "abc"
+ A9993E36 4706816A BA3E2571 7850C26C 9CD0D89D
+ "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq"
+ 84983E44 1C3BD26E BAAE4AA1 F95129E5 E54670F1
+ A million repetitions of "a"
+ 34AA973C D4C4DAA4 F61EEB2B DBAD2731 6534016F
+ */
+
+/* #define SHA1HANDSOFF  */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdint.h>
+
+#include "sha1.h"
+#define UNUSED(x) (void)(x)
+
+void SHA1_Transform(uint32_t state[5], const uint8_t buffer[64]);
+
+#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
+
+/* blk0() and blk() perform the initial expand. */
+/* I got the idea of expanding during the round function from SSLeay */
+#define blk0(i) (block->l[i] = (((uint32_t)block->c[i*4    ] << 24) | \
+                                ((uint32_t)block->c[i*4 + 1] << 16) | \
+                                ((uint32_t)block->c[i*4 + 2] <<  8) | \
+                                ((uint32_t)block->c[i*4 + 3]      )))
+#define blk(i) (block->l[i&15] = rol(block->l[(i+13)&15]^block->l[(i+8)&15] \
+^block->l[(i+2)&15]^block->l[i&15],1))
+
+/* (R0+R1), R2, R3, R4 are the different operations used in SHA1 */
+#define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk0(i)+0x5A827999+rol(v,5);w=rol(w,30);
+#define R1(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=rol(w,30);
+#define R2(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30);
+#define R3(v,w,x,y,z,i) z+=(((w|x)&y)|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30);
+#define R4(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=rol(w,30);
+
+
+#ifdef VERBOSE  /* SAK */
+void SHAPrintContext(SHA1_CTX *context, char *msg) {
+    printf("%s (%d,%d) %x %x %x %x %x\n",
+           msg,
+           context->count[0], context->count[1],
+           context->state[0],
+           context->state[1],
+           context->state[2],
+           context->state[3],
+           context->state[4]);
+}
+#endif /* VERBOSE */
+
+/* Hash a single 512-bit block. This is the core of the algorithm. */
+void SHA1_Transform(uint32_t state[5], const uint8_t buffer[64]) {
+    uint32_t a, b, c, d, e;
+    typedef union {
+        uint8_t c[64];
+        uint32_t l[16];
+    } CHAR64LONG16;
+    CHAR64LONG16* block;
+    
+#ifdef SHA1HANDSOFF
+    static uint8_t workspace[64];
+    block = (CHAR64LONG16*) workspace;
+    memcpy(block, buffer, 64);
+#else
+    block = (CHAR64LONG16*) buffer;
+#endif
+    
+    /* Copy context->state[] to working vars */
+    a = state[0];
+    b = state[1];
+    c = state[2];
+    d = state[3];
+    e = state[4];
+    
+    /* 4 rounds of 20 operations each. Loop unrolled. */
+    R0(a,b,c,d,e, 0); R0(e,a,b,c,d, 1); R0(d,e,a,b,c, 2); R0(c,d,e,a,b, 3);
+    R0(b,c,d,e,a, 4); R0(a,b,c,d,e, 5); R0(e,a,b,c,d, 6); R0(d,e,a,b,c, 7);
+    R0(c,d,e,a,b, 8); R0(b,c,d,e,a, 9); R0(a,b,c,d,e,10); R0(e,a,b,c,d,11);
+    R0(d,e,a,b,c,12); R0(c,d,e,a,b,13); R0(b,c,d,e,a,14); R0(a,b,c,d,e,15);
+    R1(e,a,b,c,d,16); R1(d,e,a,b,c,17); R1(c,d,e,a,b,18); R1(b,c,d,e,a,19);
+    R2(a,b,c,d,e,20); R2(e,a,b,c,d,21); R2(d,e,a,b,c,22); R2(c,d,e,a,b,23);
+    R2(b,c,d,e,a,24); R2(a,b,c,d,e,25); R2(e,a,b,c,d,26); R2(d,e,a,b,c,27);
+    R2(c,d,e,a,b,28); R2(b,c,d,e,a,29); R2(a,b,c,d,e,30); R2(e,a,b,c,d,31);
+    R2(d,e,a,b,c,32); R2(c,d,e,a,b,33); R2(b,c,d,e,a,34); R2(a,b,c,d,e,35);
+    R2(e,a,b,c,d,36); R2(d,e,a,b,c,37); R2(c,d,e,a,b,38); R2(b,c,d,e,a,39);
+    R3(a,b,c,d,e,40); R3(e,a,b,c,d,41); R3(d,e,a,b,c,42); R3(c,d,e,a,b,43);
+    R3(b,c,d,e,a,44); R3(a,b,c,d,e,45); R3(e,a,b,c,d,46); R3(d,e,a,b,c,47);
+    R3(c,d,e,a,b,48); R3(b,c,d,e,a,49); R3(a,b,c,d,e,50); R3(e,a,b,c,d,51);
+    R3(d,e,a,b,c,52); R3(c,d,e,a,b,53); R3(b,c,d,e,a,54); R3(a,b,c,d,e,55);
+    R3(e,a,b,c,d,56); R3(d,e,a,b,c,57); R3(c,d,e,a,b,58); R3(b,c,d,e,a,59);
+    R4(a,b,c,d,e,60); R4(e,a,b,c,d,61); R4(d,e,a,b,c,62); R4(c,d,e,a,b,63);
+    R4(b,c,d,e,a,64); R4(a,b,c,d,e,65); R4(e,a,b,c,d,66); R4(d,e,a,b,c,67);
+    R4(c,d,e,a,b,68); R4(b,c,d,e,a,69); R4(a,b,c,d,e,70); R4(e,a,b,c,d,71);
+    R4(d,e,a,b,c,72); R4(c,d,e,a,b,73); R4(b,c,d,e,a,74); R4(a,b,c,d,e,75);
+    R4(e,a,b,c,d,76); R4(d,e,a,b,c,77); R4(c,d,e,a,b,78); R4(b,c,d,e,a,79);
+    
+    /* Add the working vars back into context.state[] */
+    state[0] += a;
+    state[1] += b;
+    state[2] += c;
+    state[3] += d;
+    state[4] += e;
+    
+    /* Wipe variables */
+    a = b = c = d = e = 0;
+    UNUSED(a);UNUSED(b);UNUSED(c);UNUSED(d);UNUSED(e);
+}
+
+
+/* SHA1Init - Initialize new context */
+void SHA1_Init(SHA1_CTX* context) {
+    /* SHA1 initialization constants */
+    context->state[0] = 0x67452301;
+    context->state[1] = 0xEFCDAB89;
+    context->state[2] = 0x98BADCFE;
+    context->state[3] = 0x10325476;
+    context->state[4] = 0xC3D2E1F0;
+    context->count[0] = context->count[1] = 0;
+}
+
+
+/* Run your data through this. */
+void SHA1_Update(SHA1_CTX* context, const uint8_t* data, const size_t len) {
+    size_t i, j;
+    
+#ifdef VERBOSE
+    SHAPrintContext(context, "before");
+#endif
+    
+    j = (context->count[0] >> 3) & 63;
+    if ((context->count[0] += len << 3) < (len << 3)) context->count[1]++;
+    context->count[1] += (len >> 29);
+    if ((j + len) > 63) {
+        memcpy(&context->buffer[j], data, (i = 64-j));
+        SHA1_Transform(context->state, context->buffer);
+        for ( ; i + 63 < len; i += 64) {
+            SHA1_Transform(context->state, data + i);
+        }
+        j = 0;
+    }
+    else i = 0;
+    memcpy(&context->buffer[j], &data[i], len - i);
+    
+#ifdef VERBOSE
+    SHAPrintContext(context, "after ");
+#endif
+}
+
+
+/* Add padding and return the message digest. */
+void SHA1_Final(SHA1_CTX* context, uint8_t digest[SHA1_DIGEST_SIZE]) {
+    uint32_t i;
+    uint8_t  finalcount[8];
+    
+    for (i = 0; i < 8; i++) {
+        finalcount[i] = (unsigned char)((context->count[(i >= 4 ? 0 : 1)]
+                                         >> ((3-(i & 3)) * 8) ) & 255);  /* Endian independent */
+    }
+    SHA1_Update(context, (uint8_t *)"\200", 1);
+    while ((context->count[0] & 504) != 448) {
+        SHA1_Update(context, (uint8_t *)"\0", 1);
+    }
+    SHA1_Update(context, finalcount, 8);  /* Should cause a SHA1_Transform() */
+    for (i = 0; i < SHA1_DIGEST_SIZE; i++) {
+        digest[i] = (uint8_t)
+        ((context->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255);
+    }
+    
+    /* Wipe variables */
+    i = 0;
+    UNUSED(i);
+    memset(context->buffer, 0, 64);
+    memset(context->state, 0, 20);
+    memset(context->count, 0, 8);
+    memset(finalcount, 0, 8); /* SWR */
+    
+#ifdef SHA1HANDSOFF  /* make SHA1Transform overwrite its own static vars */
+    SHA1_Transform(context->state, context->buffer);
+#endif
+}
+
+/*************************************************************/
+
+#ifdef TEST
+int main(int argc, char** argv) {
+    int i, j;
+    SHA1_CTX context;
+    unsigned char digest[SHA1_DIGEST_SIZE], buffer[16384];
+    FILE* file;
+    if (argc > 2) {
+        puts("Public domain SHA-1 implementation - by Steve Reid <sreid@sea-to-sky.net>");
+        puts("Modified for 16 bit environments 7/98 - by James H. Brown <jbrown@burgoyne.com>");  /* JHB */
+        puts("Produces the SHA-1 hash of a file, or stdin if no file is specified.");
+        return(0);
+    }
+    if (argc < 2) {
+        file = stdin;
+    }
+    else {
+        if (!(file = fopen(argv[1], "rb"))) {
+            fputs("Unable to open file.", stderr);
+            return(-1);
+        }
+    }
+    SHA1_Init(&context);
+    while (!feof(file)) {  /* note: what if ferror(file) */
+        i = fread(buffer, 1, 16384, file);
+        SHA1_Update(&context, buffer, i);
+    }
+    SHA1_Final(&context, digest);
+    fclose(file);
+    for (i = 0; i < SHA1_DIGEST_SIZE/4; i++) {
+        for (j = 0; j < 4; j++) {
+            printf("%02X", digest[i*4+j]);
+        }
+        putchar(' ');
+    }
+    putchar('\n');
+    return(0);  /* JHB */
+}
+#endif

app/src/main/cpp/libmobi/src/sha1.h

@@ -0,0 +1,27 @@
+/** @file sha1.h
+ *  @brief Header for sha1.c
+ *
+ * Copyright (c) 2014 Bartek Fabiszewski
+ * http://www.fabiszewski.net
+ *
+ * This file is part of libmobi.
+ * Licensed under LGPL, either version 3, or any later.
+ * See <http://www.gnu.org/licenses/>
+ */
+
+#ifndef mobi_sha1_h
+#define mobi_sha1_h
+
+typedef struct {
+    uint32_t state[5];
+    uint32_t count[2];
+    uint8_t buffer[64];
+} SHA1_CTX;
+
+#define SHA1_DIGEST_SIZE 20
+
+void SHA1_Init(SHA1_CTX *context);
+void SHA1_Update(SHA1_CTX *context, const uint8_t *data, const size_t len);
+void SHA1_Final(SHA1_CTX *context, uint8_t digest[SHA1_DIGEST_SIZE]);
+
+#endif /* sha1_h */

app/src/main/cpp/libmobi/src/structure.c

@@ -0,0 +1,566 @@
+/** @file structure.c
+ *  @brief Data structures
+ *
+ * Copyright (c) 2014 Bartek Fabiszewski
+ * http://www.fabiszewski.net
+ *
+ * This file is part of libmobi.
+ * Licensed under LGPL, either version 3, or any later.
+ * See <http://www.gnu.org/licenses/>
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include "structure.h"
+#include "debug.h"
+#if defined(__BIONIC__) && !defined(SIZE_MAX)
+#include <limits.h> /* for SIZE_MAX */
+#endif
+
+/**
+ @brief Initializer for MOBIArray structure
+ 
+ It allocates memory for structure and for data: array of uint32_t variables.
+ Memory should be freed with array_free().
+ 
+ @param[in] len Initial size of the array
+ @return MOBIArray on success, NULL otherwise
+ */
+MOBIArray * array_init(const size_t len) {
+    MOBIArray *arr = NULL;
+    arr = malloc(sizeof(MOBIArray));
+    if (arr == NULL) {
+        debug_print("%s", "Array allocation failed\n");
+        return NULL;
+    }
+    arr->data = malloc(len * sizeof(*arr->data));
+    if (arr->data == NULL) {
+        free(arr);
+        debug_print("%s", "Array data allocation failed\n");
+        return NULL;
+    }
+    arr->maxsize = len;
+    arr->step = len ? len : 1;
+    arr->size = 0;
+    return arr;
+}
+
+/**
+ @brief Inserts value into MOBIArray array
+ 
+ @param[in,out] arr MOBIArray array
+ @param[in] value Value to be inserted
+ @return MOBI_RET status code (on success MOBI_SUCCESS)
+ */
+MOBI_RET array_insert(MOBIArray *arr, const uint32_t value) {
+    if (!arr || arr->maxsize == 0) {
+        return MOBI_INIT_FAILED;
+    }
+    if (arr->maxsize == arr->size) {
+        arr->maxsize += arr->step;
+        uint32_t *tmp = realloc(arr->data, arr->maxsize * sizeof(*arr->data));
+        if (!tmp) {
+            free(arr->data);
+            arr->data = NULL;
+            debug_print("%s\n", "Memory allocation failed");
+            return MOBI_MALLOC_FAILED;
+        }
+        arr->data = tmp;
+    }
+    arr->data[arr->size] = value;
+    arr->size++;
+    return MOBI_SUCCESS;
+}
+
+/**
+ @brief Helper for qsort in array_sort() function.
+ 
+ @param[in] a First element to compare
+ @param[in] b Second element to compare
+ @return -1 if a < b; 1 if a > b; 0 if a = b
+ */
+static int array_compare(const void *a, const void *b) {
+    if (*(uint32_t *) a < *(uint32_t *) b) {
+        return -1;
+    };
+    if (*(uint32_t *) a > *(uint32_t *) b) {
+        return 1;
+    };
+    return 0;
+}
+
+/**
+ @brief Sort MOBIArray in ascending order.
+ 
+ When unique is set to true, duplicate values are discarded.
+ 
+ @param[in,out] arr MOBIArray array
+ @param[in] unique Discard duplicate values if true
+ */
+void array_sort(MOBIArray *arr, const bool unique) {
+    if (!arr || !arr->data || arr->size == 0) {
+        return;
+    }
+    qsort(arr->data, arr->size, sizeof(*arr->data), array_compare);
+    if (unique) {
+        size_t i = 1;
+        size_t j = 1;
+        while (i < arr->size) {
+            if (arr->data[j - 1] == arr->data[i]) {
+                i++;
+                continue;
+            }
+            arr->data[j++] = arr->data[i++];
+        }
+        arr->size = j;
+    }
+}
+
+/**
+ @brief Get size of the array
+ 
+ @param[in] arr MOBIArray structure
+ @return Array size
+ */
+size_t array_size(MOBIArray *arr) {
+    return arr->size;
+}
+
+/**
+ @brief Free MOBIArray structure and contained data
+ 
+ Free data initialized with array_init();
+ 
+ @param[in] arr MOBIArray structure
+ */
+void array_free(MOBIArray *arr) {
+    if (!arr) { return; }
+    if (arr->data) {
+        free(arr->data);
+    }
+    free(arr);
+}
+
+
+/**
+ @brief Create and return MOBITrie structure
+ 
+ @return MOBITrie stucture initialized with zeroes
+ */
+static MOBITrie * mobi_trie_mknode(void) {
+    MOBITrie *node = calloc(1, sizeof(MOBITrie));
+    if (node == NULL) {
+        debug_print("Memory allocation failed%s", "\n");
+    }
+    return node;
+}
+
+/**
+ @brief Recursively free MOBITrie trie starting from node
+ 
+ @param[in] node Starting node
+ */
+void mobi_trie_free(MOBITrie *node) {
+    if (node) {
+        mobi_trie_free(node->next);
+        mobi_trie_free(node->children);
+        free(node->values);
+        free(node);
+    }
+}
+
+/**
+ @brief Insert value into array at given MOBITrie node
+ 
+ @param[in,out] node Starting node
+ @param[in] value Value to be inserted
+ @return MOBI_RET status code (on success MOBI_SUCCESS)
+ */
+static MOBI_RET mobi_trie_addvalue(MOBITrie *node, char *value) {
+    if (node->values) {
+        size_t cnt = ++node->values_count;
+        void *new_values = realloc(node->values, cnt * sizeof(*node->values));
+        if (new_values == NULL) {
+            debug_print("Memory allocation failed%s", "\n");
+            return MOBI_MALLOC_FAILED;
+        }
+        node->values = new_values;
+        node->values[cnt - 1] = value;
+    } else {
+        node->values = malloc(sizeof(*node->values));
+        if (node->values == NULL) {
+            debug_print("Memory allocation failed%s", "\n");
+            return MOBI_MALLOC_FAILED;
+        }
+        node->values[0] = value;
+        node->values_count = 1;
+    }
+    return MOBI_SUCCESS;
+}
+
+/**
+ @brief Insert key character and value (if given) at MOBITrie node
+ 
+ @param[in,out] node Starting node
+ @param[in] c Key character
+ @param[in] value Value to be inserted at terminal node, or NULL if not terminal
+ @return MOBITrie node: current node if value inserted (terminal), 
+         children node (if transitional) or NULL on error
+ */
+static MOBITrie * mobi_trie_insert_char(MOBITrie *node, char c, char *value) {
+    if (!node) { return NULL; }
+    while (true) {
+        if (node->c == c) {
+            break;
+        }
+        if (node->next == NULL) {
+            node->next = mobi_trie_mknode();
+            node = node->next;
+            break;
+        }
+        node = node->next;
+    }
+    if (node->c == 0) {
+        node->c = c;
+    }
+    if (value) {
+        /* terminal node */
+        if (mobi_trie_addvalue(node, value) == MOBI_SUCCESS) {
+            return node;
+        }
+        return NULL;
+    }
+    if (node->children == NULL) {
+        node->children = mobi_trie_mknode();
+    }
+    return node->children;
+}
+
+/**
+ @brief Insert reversed string into MOBITrie trie
+ 
+ @param[in,out] root Root node
+ @param[in] string String to be inserted
+ @param[in] value Value associated with the string
+ @return MOBI_RET status code (on success MOBI_SUCCESS)
+ */
+MOBI_RET mobi_trie_insert_reversed(MOBITrie **root, char *string, char *value) {
+    size_t length = strlen(string);
+    if (length == 0) {
+        debug_print("Skipping empty lookup string in trie node%s", "\n");
+        return MOBI_SUCCESS;
+    }
+    if (*root == NULL) {
+        *root = mobi_trie_mknode();
+        if (*root == NULL) {
+            return MOBI_MALLOC_FAILED;
+        }
+    }
+    MOBITrie *node = *root;
+    while (length > 1) {
+        node = mobi_trie_insert_char(node, string[length - 1], NULL);
+        if (node == NULL) {
+            return MOBI_MALLOC_FAILED;
+        }
+        length--;
+    }
+    node = mobi_trie_insert_char(node, string[length - 1], value);
+    if (node == NULL) {
+        return MOBI_MALLOC_FAILED;
+    }
+    return MOBI_SUCCESS;
+}
+
+/**
+ @brief Fetch values for key c from MOBITrie trie's current level starting at node
+ 
+ @param[in,out] values Array of values to be fetched
+ @param[in,out] values_count Array size
+ @param[in] node MOBITrie node to start search
+ @param[in] c Key character
+ @return MOBITrie children node of the node with c key or NULL if not found
+ */
+MOBITrie * mobi_trie_get_next(char ***values, size_t *values_count, const MOBITrie *node, const char c) {
+    if (!node) { return NULL; }
+    while (node) {
+        if (node->c == c) {
+            *values = (char**) node->values;
+            *values_count = node->values_count;
+            return node->children;
+        }
+        node = node->next;
+    }
+    return NULL;
+}
+
+#if 0
+/* Simple imprementation of binary tree, storing key strings 
+ and associated arrays of values
+ currently not used, save for later */
+
+typedef struct MOBIBtree {
+    char *key; /**< key */
+    char **array; /**< array of strings */
+    size_t value_count; /**< strings count */
+    struct MOBIBtree *left; /**< left child */
+    struct MOBIBtree *right; /**< right child */
+} MOBIBtree;
+
+/**
+ @brief Search MOBIBtree tree for string key
+ 
+ @param[in] node MOBIBtree node to start search
+ @param[in] key Key string
+ @return MOBIBtree node or NULL if not found
+ */
+MOBIBtree *mobi_btree_search(MOBIBtree *node, const char *key) {
+    MOBIBtree *found = NULL;
+    int compare = strcmp(key, node->key);
+    if (compare < 0) {
+        found = mobi_btree_search(node->left, key);
+    } else if (compare > 0) {
+        found = mobi_btree_search(node->right, key);
+    } else {
+        found = node;
+    }
+    return found;
+}
+
+/**
+ @brief Insert key and value (into array) into MOBIBtree tree
+ 
+ @param[in] node MOBIBtree root node
+ @param[in] key Key string
+ @param[in] value Value string will be inserted into array
+ @return MOBI_RET status code (on success MOBI_SUCCESS)
+ */
+MOBI_RET mobi_btree_insert(MOBIBtree **node, char *key, char *value) {
+    MOBI_RET ret = MOBI_SUCCESS;
+    if (*node == NULL) {
+        *node = malloc(sizeof(MOBIBtree));
+        if (*node == NULL) {
+            return MOBI_MALLOC_FAILED;
+        }
+        (*node)->key = key;
+        (*node)->value_count = 1;
+        (*node)->array = malloc(sizeof(*(*node)->array));
+        if ((*node)->array == NULL) {
+            free(*node);
+            return MOBI_MALLOC_FAILED;
+        }
+        (*node)->array[0] = value;
+        (*node)->left = NULL;
+        (*node)->right = NULL;
+        return MOBI_SUCCESS;
+    }
+    int compare = strcmp(key, (*node)->key);
+    if (compare < 0) {
+        ret = mobi_btree_insert(&(*node)->left, key, value);
+    } else if (compare > 0) {
+        ret = mobi_btree_insert(&(*node)->right, key, value);
+    } else {
+        size_t cnt = ++(*node)->value_count;
+        char **new_array = realloc((*node)->array, cnt * sizeof(*(*node)->array));
+        if (new_array) {
+            (*node)->array = new_array;
+            (*node)->array[cnt - 1] = value;
+        } else {
+            return MOBI_MALLOC_FAILED;
+        }
+    }
+    return ret;
+}
+#endif
+
+
+/**
+ @brief Allocate fragment, fill with data and return
+ 
+ @param[in] raw_offset Fragment offset in raw markup,
+ SIZE_MAX if not present in original markup
+ @param[in] fragment Fragment data
+ @param[in] size Size data
+ @param[in] is_malloc is_maloc data
+ @return Fragment structure filled with data
+ */
+static MOBIFragment * mobi_list_init(size_t raw_offset, unsigned char *fragment, const size_t size, const bool is_malloc) {
+    MOBIFragment *curr = calloc(1, sizeof(MOBIFragment));
+    if (curr == NULL) {
+        if (is_malloc) {
+            free(fragment);
+        }
+        return NULL;
+    }
+    curr->raw_offset = raw_offset;
+    curr->fragment = fragment;
+    curr->size = size;
+    curr->is_malloc = is_malloc;
+    return curr;
+}
+
+/**
+ @brief Allocate fragment, fill with data, append to linked list
+ 
+ @param[in] curr Last fragment in linked list
+ @param[in] raw_offset Fragment offset in raw markup,
+ SIZE_MAX if not present in original markup
+ @param[in] fragment Fragment data
+ @param[in] size Size data
+ @param[in] is_malloc is_maloc data
+ @return Fragment structure filled with data
+ */
+MOBIFragment * mobi_list_add(MOBIFragment *curr, size_t raw_offset, unsigned char *fragment, const size_t size, const bool is_malloc) {
+    if (!curr) {
+        return mobi_list_init(raw_offset, fragment, size, is_malloc);
+    }
+    curr->next = calloc(1, sizeof(MOBIFragment));
+    if (curr->next == NULL) {
+        if (is_malloc) {
+            free(fragment);
+        }
+        return NULL;
+    }
+    MOBIFragment *next = curr->next;
+    next->raw_offset = raw_offset;
+    next->fragment = fragment;
+    next->size = size;
+    next->is_malloc = is_malloc;
+    return next;
+}
+
+/**
+ @brief Allocate fragment, fill with data,
+ insert into linked list at given offset
+ 
+ Starts to search for offset at given fragment. The pointer to input fragment will be replaced by newly added one.
+ 
+ @param[in,out] fragment Fragment where search starts, on success pointer to new fragment structure filled with data
+ @param[in] raw_offset Fragment offset in raw markup, SIZE_MAX if not present in original markup
+ @param[in] data Fragment data
+ @param[in] size Size data
+ @param[in] is_malloc is_maloc data
+ @param[in] offset offset where new chunk will be inserted
+ @return MOBI_RET status code (on success MOBI_SUCCESS, on offset not found MOBI_DATA_CORRUPT)
+ */
+MOBI_RET mobi_list_insert(MOBIFragment **fragment, size_t raw_offset, unsigned char *data, const size_t size, const bool is_malloc, const size_t offset) {
+    MOBIFragment *curr = *fragment;
+    MOBIFragment *prev = NULL;
+    while (curr) {
+        if (curr->raw_offset != SIZE_MAX && curr->raw_offset <= offset && curr->raw_offset + curr->size >= offset ) {
+            break;
+        }
+        prev = curr;
+        curr = curr->next;
+    }
+    if (!curr) {
+        debug_print("Offset not found: %zu\n", offset);
+        if (is_malloc) {
+            free(data);
+        }
+        return MOBI_DATA_CORRUPT;
+    }
+    MOBIFragment *new = calloc(1, sizeof(MOBIFragment));
+    if (new == NULL) {
+        if (is_malloc) {
+            free(data);
+        }
+        return MOBI_MALLOC_FAILED;
+    }
+    new->raw_offset = raw_offset;
+    new->fragment = data;
+    new->size = size;
+    new->is_malloc = is_malloc;
+    MOBIFragment *new2 = NULL;
+    if (curr->raw_offset == offset) {
+        /* prepend chunk */
+        if (prev) {
+            prev->next = new;
+            new->next = curr;
+        } else {
+            /* save curr */
+            MOBIFragment tmp;
+            tmp.raw_offset = curr->raw_offset;
+            tmp.fragment = curr->fragment;
+            tmp.size = curr->size;
+            tmp.is_malloc = curr->is_malloc;
+            tmp.next = curr->next;
+            /* move new to curr */
+            curr->raw_offset = new->raw_offset;
+            curr->fragment = new->fragment;
+            curr->size = new->size;
+            curr->is_malloc = new->is_malloc;
+            curr->next = new;
+            /* restore tmp to new */
+            new->raw_offset = tmp.raw_offset;
+            new->fragment = tmp.fragment;
+            new->size = tmp.size;
+            new->is_malloc = tmp.is_malloc;
+            new->next = tmp.next;
+            *fragment = curr;
+            return MOBI_SUCCESS;
+        }
+    } else if (curr->raw_offset + curr->size == offset) {
+        /* append chunk */
+        new->next = curr->next;
+        curr->next = new;
+    } else {
+        /* split fragment and insert new chunk */
+        new2 = calloc(1, sizeof(MOBIFragment));
+        if (new2 == NULL) {
+            free(new);
+            if (is_malloc) {
+                free(data);
+            }
+            return MOBI_MALLOC_FAILED;
+        }
+        size_t rel_offset = offset - curr->raw_offset;
+        new2->next = curr->next;
+        new2->size = curr->size - rel_offset;
+        new2->raw_offset = offset;
+        new2->fragment = curr->fragment + rel_offset;
+        new2->is_malloc = false;
+        curr->next = new;
+        curr->size = rel_offset;
+        new->next = new2;
+    }
+    /* correct offsets */
+    if (raw_offset != SIZE_MAX) {
+        curr = new->next;
+        while (curr) {
+            if (curr->raw_offset != SIZE_MAX) {
+                curr->raw_offset += new->size;
+            }
+            curr = curr->next;
+        }
+    }
+    *fragment = new;
+    return MOBI_SUCCESS;
+}
+
+/**
+ @brief Delete fragment from linked list
+ 
+ @param[in] curr Fragment to be deleted
+ @return Next fragment in the linked list or NULL if absent
+ */
+MOBIFragment * mobi_list_del(MOBIFragment *curr) {
+    MOBIFragment *del = curr;
+    curr = curr->next;
+    if (del->is_malloc) {
+        free(del->fragment);
+    }
+    free(del);
+    del = NULL;
+    return curr;
+}
+
+/**
+ @brief Delete all fragments from linked list
+ 
+ @param[in] first First fragment from the list
+ */
+void mobi_list_del_all(MOBIFragment *first) {
+    while (first) {
+        first = mobi_list_del(first);
+    }
+}

app/src/main/cpp/libmobi/src/structure.h

@@ -0,0 +1,66 @@
+/** @file structure.h
+ *
+ * Copyright (c) 2014 Bartek Fabiszewski
+ * http://www.fabiszewski.net
+ *
+ * This file is part of libmobi.
+ * Licensed under LGPL, either version 3, or any later.
+ * See <http://www.gnu.org/licenses/>
+ */
+
+#ifndef mobi_structure_h
+#define mobi_structure_h
+
+#include "config.h"
+#include "mobi.h"
+
+/**
+ @brief Dynamic array of uint32_t values structure
+ */
+typedef struct {
+    uint32_t *data; /**< Array */
+    size_t maxsize; /**< Allocated size */
+    size_t step; /**< Step by which array will be enlarged if out of memory */
+    size_t size; /**< Current size */
+} MOBIArray;
+
+MOBIArray * array_init(const size_t len);
+MOBI_RET array_insert(MOBIArray *arr, const uint32_t value);
+void array_sort(MOBIArray *arr, const bool unique);
+size_t array_size(MOBIArray *arr);
+void array_free(MOBIArray *arr);
+
+/**
+ @brief Trie storing arrays of values for character keys
+ */
+typedef struct MOBITrie {
+    char c; /**< Key character */
+    void **values; /**< Array of values */
+    size_t values_count; /**< Array size */
+    struct MOBITrie *next; /**< Next node at the same level */
+    struct MOBITrie *children; /**< Link to children nodes, lower level */
+} MOBITrie;
+
+MOBI_RET mobi_trie_insert_reversed(MOBITrie **root, char *string, char *value);
+MOBITrie * mobi_trie_get_next(char ***values, size_t *values_count, const MOBITrie *node, const char c);
+void mobi_trie_free(MOBITrie *node);
+
+/**
+ @brief Structure for links reconstruction.
+ 
+ Linked list of Fragment structures forms whole document part
+ */
+typedef struct MOBIFragment {
+    size_t raw_offset; /**< fragment offset in raw markup, SIZE_MAX if not present in original markup */
+    unsigned char *fragment; /**< Fragment data */
+    size_t size; /**< Fragment size */
+    bool is_malloc; /**< Is it needed to free this fragment or is it just an alias to part data */
+    struct MOBIFragment *next; /**< Link to next fragment */
+} MOBIFragment;
+
+MOBIFragment * mobi_list_add(MOBIFragment *curr, size_t raw_offset, unsigned char *fragment, const size_t size, const bool is_malloc);
+MOBIFragment * mobi_list_del(MOBIFragment *curr);
+MOBI_RET mobi_list_insert(MOBIFragment **curr, size_t raw_offset, unsigned char *fragment, const size_t size, const bool is_malloc, const size_t offset);
+void mobi_list_del_all(MOBIFragment *first);
+
+#endif